The GM is already compiled to 0.3c.
UPDATE:
Speedometer now turns off the engine when you're out of fuel.
Previously your car could drive at a very low speed, but it could still drive.
Now you cannot drive at all.
Also, during missions as a pilot, you were forced down when you where flying a helicopter, otherwise you could drift away with the wind, while being unable to control your helicopter.
Now the engine is turned off as well when you reach a checkpoint with helicopter missions.
As for the house system and car shops, I don't know when those will be ready.
My fulltime job starts again tomorrow and I just found out that I've lost my locations-file by switching to SAMP 0.3c.
This file held all location-data I had found earlier for expanding the missions.
When I installed the 0.3c server, I deleted everything in the folder where I installed my server-pack and put the new files in place.
I forgot to backup that file, now it's gone
Even all my player account-data is gone, but that's no problem as there only were 2 files in there (mine and my son's).