There are no physics changes - this is a 100% compatible patch, which means that everyone can connect together online, and all the hotlaps remain valid.
Physics changes will be saved for a later patch. We try to keep as many physics and multiplayer changes as possible, in the same test patch, because each time there are any *incompatible* changes, people with the new patch can't connect to hosts using the old patch, all the hotlap tables must be deleted, etc...
This post would be more useful if you stated which fixes you can't wait for, ideally with a link to their thread. I don't have very many exciting bug fixes listed at high priority. My main priority is to get this batch of compatible patches finished so i can get onto physics updates.
It's a thing used in games, the world is divided into squares. Then all interactable objects (physics objects etc) are registered on these squares.
It's an optimisation so that for each collision test (or whatever interaction) you only check the objects that are registered on the nearby squares, instead of all the objects in the world.
It's mainly a new characters patch yes - it was complicated and so many lines have changed, i can't have covered all situations. So needs a lot of testing - and the new translations will need testing in the new system - so i guess there will be two test patches only week apart.
There are some other bugs that can be fixed in a compatible patch, so i'll see what i can do between now and Friday evening - which is when i hope to release it, unless things take a bit longer then it would be Saturday. No physics changes, so the FO8 leaning back / any physics improvements will be left for a later incompatible patch. As a guess, i guess this coming batch of test patches will be the final ones in this stage of physics.