heidfeld will certainly up the preasure on rosberg even more, not only does he need to prove he's at least close to the speed of schumacher but he now has to prove he's quicker in testing than another experienced german that whilst not being the fastest driver, is known for his ability to get the car to the finish.
actually I don´t think he will be doing any testing other then Simulator, or tests on the straight. So not really pressure for Nico from him. Nicos pressure will come from having Michael Schumacher as a team mate and not Heidfeld.
bring back prequalifying. make it so for the first 6 races all the new teams and those who want to join prequalify like they did in the early 90's, fastest 3 teams (regardless of how fast their second driver is) get the garages for the proper practice / qualifying. that way we might see them giving at least one seat to someone who's fast rather than the driver's with the most cash.
after 6 races make it that it's the teams with the lowest championship scores that prequalify. next season it's the teams that finished lowest plus any more new teams for the first 6 races. apart from anything else it would soon weed out the teams that weren't serious and / or underfunded
I don't get what Renault is doing with their car really.
When Kubica was in Renault factory he said new car (R30) is really longer because of bigger fuel tank. The car he has driven in tests looked like R29 with minor changes and it wasn't really longer... 3cm or so isn't 25cm. And they still managed to put there a new huge fuel tank!
Also, what is not common Kubica speaks quite positive about their new car which is just like crappy R29, while James Allison says:
When asked about masked diffusor Allison said it will be different later so there is no point to see this one, with smile.
What the hell they test if it's not R29 or R30 either?
Most teams change their cars significantly over the course of a season: floor, wings, intakes, etc. Allison was merely speaking the obvious.
Don't expect teams to speak frankly about their car development. All they'll say are vague and obvious things like what you quoted from Allison. No team will outline precisely what has changed or what they'll do to their car.
as sam says don't be surprised to see the front and rear wings etc. change in the last tests, once the teams know that the aero data is matching the real life results they can afford to hide away the best bits till the last test or even the first race. additionally when you get mclaren averaging one newly designed component on a car every 20 mins durring a season it's a fair bet to say that cars will change a lot before the first race