This thread shall deal with everything which is not Formula 1 or Indy Car. I guess, you will understand when you read this opening post.
Starting with what shall be the series future Formula 1 champions are racing in... maybe. Actually 3 Series with very similar cars, GP2, Formula 3.5l World Series by Renault and AutoGP are to be considered as Level 2 under F1. FIA's/Palmer's Formula 2 is rather something between GP2-alikes and F3, with drivers going to one of the earlier mentioned series after their F2 season(s).
GP2-Series
The GP2 is the closest series to Formula 1. Why? Well, it races on the same tracks and weekends. After the decline of GP2 Asia, the original GP2 series also features races at Bahrain, Sepang and Singapure this year. 11 of 12 events GP2 will support F1 in 2012.
23.-25.03.2012 - Sepang (Malaysia)
20.-22.04.2012 - Manama (Bahrain)
26.-28.04.2012 - Manama (Bahrain)
11.-13.05.2012 - Barcelona (Spain)
24.-26.05.2012 - Monte Carlo (Monaco)
22.-24.06.2012 - Valencia (Spain)
06.-08.07.2012 - Silverstone (United Kingdom)
20.-22.07.2012 - Hockenheim (Germany)
27.-29.07.2012 - Budapest (Hungary)
31.08.-02.09.2012 - Spa-Francorchamps (Belgium)
07.-09.09.2012 - Monza (Italy)
21.-23.09.2012 - Singapore
Formula Renault 3.5 Series
Part of the World Series by Renault, except at two events in 2012, Formula Renault 3.5 returns to 9 European circuits. A new chassis and DRS will premier in this series.
05.-06.05.2012 - Aragon (Spain)
26.-27.05.2012 - Monte Carlo (Monaco)
02.-03.05.2012 - Spa-Francorchamps (Belgium)
30.06.-01.07.2012 - Nürburgring (Germany)
14.-15.07.2012 - Moscow (Russia)
25.-26.08.2012 - TBC
15.-16.09.2012 - Budapest (Hungary)
29.-30.09.2012 - Paul Ricard (France)
20.-21.10.2012 - Barcelona (Spain)
AutoGP
The Italian Formula 3000 became more and more international. Now it is called AutoGP and will support the FIA WTCC. Thereby it features the most international calendar with races on 4 (of 7) continents. New in 2012 - Push-to-pass technology, called "overboost".
11.03.2012 - Monza (Italy)
01.04.2012 - Ricardo Tormo (Spain)
15.04.2012 - Marrakech (Marocco)
06.05.2012 - Budapest (Hungary)
03.06.2012 - Estoril (Portugal)
22.07.2012 - Curitiba (Brazil)
23.09.2012 - Sonoma (United States)
FIA Formula 2
Fourth total season of the new Formula 2.
13.-15.04.2012 - Silverstone (United Kingdom)
27.-29.04.2012 - Algarve (Portugal)
25.-27.05.2012 - Nürburgring (Germany)
22.-24.06.2012 - Spa-Francorchamps (Belgium)
13.-15.07.2012 - Brands Hatch (United Kingdom)
20.-22.07.2012 - Paul Ricard (France)
07.-09.09.2012 - Budapest (Hungary)
28.-30.09.2012 - Monza (Italy)
Pole position comparison - Monza
1:32.349 GP2 Series (2011)
1:35.936 AutoGP (2011)
1:36.254 Formula Renault 3.5 Series (2011)
1:39.935 Formula 2 (2010)
Formula 3 series (*=Principal Series - The champions of these series can be given FIA Super Licences valid for 12 months.)
*FIA Formula 3 International Trophy
TBA
*Formula 3 Euro Series (former French F3)
27.-29.04.2012 - Hockenheim (Germany)
04.-06.05.2012 - EuroSpeedway Lausitz (Germany)
01.-03.06.2012 - Spielberg (Austria)
29.06.-01.07.2012 - Nuremberg (Germany)
17.-19.08.2012 - Nürburgring (Germany)
24.-26.08.2012 - Zandvoort (Netherlands)
14.-26.09.2012 - Oschersleben (Germany)
28.-30.09.2012 - Ricardo Tormo (Spain)
19.-21.10.2012 - Hockenheim (Germany)
*European Formula 3 Open (former Spanish F3)
27.-29.04.2012 - Algarve (Portugal)
25.-27.05.2012 - Nürburgring (Germany)
22.-24.06.2012 - Spa-Francorchamps (Belgium)
13.-15.07.2012 - Brands Hatch (United Kingdom)
20.-22.07.2012 - Paul Ricard (France)
07.-09.09.2012 - Budapest (Hungary)
28.-30.09.2012 - Monza (Italy)
*British Formula 3 International Series
As most SRO championships, TBA
*Italian Formula 3
31.03.-01.04.2012 - Ricardo Tormo (Spain)
05.-06.05.2012 - Budapest (Hungary)
09.-10.06.2012 - Mugello (Italy)
07.-08.07.2012 - Misano (Italy)
04.-05.08.2012 - Spielberg (Austria)
01.-02.09.2012 - Imola (Italy)
15.-16.09.2012 - Vallelunga (Italy)
20.-21.10.2012 - Monza (Italy)
*All-Japan Formula Three Championship
TBA
Formel 3 Cup (former German F3)
13.-15.04.2012 - Oschersleben (Germany)
11.-13.05.2012 - Zandvoort (Netherlands)
08.-10.06.2012 - Sachsenring (Germany)
10.-12.08.2012 - Spielberg (Austria)
31.08.-02.09.2012 - EuroSpeedway Lausitz (Germany)
14.-16.09.2012 - Nürburgring (Germany)
05.-07.10.2012 - Hockenheim (Germany)
Austria Formel 3 Cup
TBA
Formula Three Sudamericana
TBA
Nordic Formula 3 Masters (former Finish F3)
TBA
Formula 3 Australian Drivers Championship
TBA
GP3 Series
TBA
Starting with what shall be the series future Formula 1 champions are racing in... maybe. Actually 3 Series with very similar cars, GP2, Formula 3.5l World Series by Renault and AutoGP are to be considered as Level 2 under F1. FIA's/Palmer's Formula 2 is rather something between GP2-alikes and F3, with drivers going to one of the earlier mentioned series after their F2 season(s).
GP2-Series
The GP2 is the closest series to Formula 1. Why? Well, it races on the same tracks and weekends. After the decline of GP2 Asia, the original GP2 series also features races at Bahrain, Sepang and Singapure this year. 11 of 12 events GP2 will support F1 in 2012.
23.-25.03.2012 - Sepang (Malaysia)
20.-22.04.2012 - Manama (Bahrain)
26.-28.04.2012 - Manama (Bahrain)
11.-13.05.2012 - Barcelona (Spain)
24.-26.05.2012 - Monte Carlo (Monaco)
22.-24.06.2012 - Valencia (Spain)
06.-08.07.2012 - Silverstone (United Kingdom)
20.-22.07.2012 - Hockenheim (Germany)
27.-29.07.2012 - Budapest (Hungary)
31.08.-02.09.2012 - Spa-Francorchamps (Belgium)
07.-09.09.2012 - Monza (Italy)
21.-23.09.2012 - Singapore
Formula Renault 3.5 Series
Part of the World Series by Renault, except at two events in 2012, Formula Renault 3.5 returns to 9 European circuits. A new chassis and DRS will premier in this series.
05.-06.05.2012 - Aragon (Spain)
26.-27.05.2012 - Monte Carlo (Monaco)
02.-03.05.2012 - Spa-Francorchamps (Belgium)
30.06.-01.07.2012 - Nürburgring (Germany)
14.-15.07.2012 - Moscow (Russia)
25.-26.08.2012 - TBC
15.-16.09.2012 - Budapest (Hungary)
29.-30.09.2012 - Paul Ricard (France)
20.-21.10.2012 - Barcelona (Spain)
AutoGP
The Italian Formula 3000 became more and more international. Now it is called AutoGP and will support the FIA WTCC. Thereby it features the most international calendar with races on 4 (of 7) continents. New in 2012 - Push-to-pass technology, called "overboost".
11.03.2012 - Monza (Italy)
01.04.2012 - Ricardo Tormo (Spain)
15.04.2012 - Marrakech (Marocco)
06.05.2012 - Budapest (Hungary)
03.06.2012 - Estoril (Portugal)
22.07.2012 - Curitiba (Brazil)
23.09.2012 - Sonoma (United States)
FIA Formula 2
Fourth total season of the new Formula 2.
13.-15.04.2012 - Silverstone (United Kingdom)
27.-29.04.2012 - Algarve (Portugal)
25.-27.05.2012 - Nürburgring (Germany)
22.-24.06.2012 - Spa-Francorchamps (Belgium)
13.-15.07.2012 - Brands Hatch (United Kingdom)
20.-22.07.2012 - Paul Ricard (France)
07.-09.09.2012 - Budapest (Hungary)
28.-30.09.2012 - Monza (Italy)
Pole position comparison - Monza
1:32.349 GP2 Series (2011)
1:35.936 AutoGP (2011)
1:36.254 Formula Renault 3.5 Series (2011)
1:39.935 Formula 2 (2010)
Formula 3 series (*=Principal Series - The champions of these series can be given FIA Super Licences valid for 12 months.)
*FIA Formula 3 International Trophy
TBA
*Formula 3 Euro Series (former French F3)
27.-29.04.2012 - Hockenheim (Germany)
04.-06.05.2012 - EuroSpeedway Lausitz (Germany)
01.-03.06.2012 - Spielberg (Austria)
29.06.-01.07.2012 - Nuremberg (Germany)
17.-19.08.2012 - Nürburgring (Germany)
24.-26.08.2012 - Zandvoort (Netherlands)
14.-26.09.2012 - Oschersleben (Germany)
28.-30.09.2012 - Ricardo Tormo (Spain)
19.-21.10.2012 - Hockenheim (Germany)
*European Formula 3 Open (former Spanish F3)
27.-29.04.2012 - Algarve (Portugal)
25.-27.05.2012 - Nürburgring (Germany)
22.-24.06.2012 - Spa-Francorchamps (Belgium)
13.-15.07.2012 - Brands Hatch (United Kingdom)
20.-22.07.2012 - Paul Ricard (France)
07.-09.09.2012 - Budapest (Hungary)
28.-30.09.2012 - Monza (Italy)
*British Formula 3 International Series
As most SRO championships, TBA
*Italian Formula 3
31.03.-01.04.2012 - Ricardo Tormo (Spain)
05.-06.05.2012 - Budapest (Hungary)
09.-10.06.2012 - Mugello (Italy)
07.-08.07.2012 - Misano (Italy)
04.-05.08.2012 - Spielberg (Austria)
01.-02.09.2012 - Imola (Italy)
15.-16.09.2012 - Vallelunga (Italy)
20.-21.10.2012 - Monza (Italy)
*All-Japan Formula Three Championship
TBA
Formel 3 Cup (former German F3)
13.-15.04.2012 - Oschersleben (Germany)
11.-13.05.2012 - Zandvoort (Netherlands)
08.-10.06.2012 - Sachsenring (Germany)
10.-12.08.2012 - Spielberg (Austria)
31.08.-02.09.2012 - EuroSpeedway Lausitz (Germany)
14.-16.09.2012 - Nürburgring (Germany)
05.-07.10.2012 - Hockenheim (Germany)
Austria Formel 3 Cup
TBA
Formula Three Sudamericana
TBA
Nordic Formula 3 Masters (former Finish F3)
TBA
Formula 3 Australian Drivers Championship
TBA
GP3 Series
TBA