Okay, tried out the wrench and bio field generator in a local game, they're awesome.
Observations:
During the respawn timer, your teams name is shown above it, nice touch.
Crashing your warhawk has a new fullscreen red flash effect.
The wrench makes a nice thud when hitting someone, a nice clang when repairing a vehicle, and a louder junk clash sound when damaging one.
4 wrench hits to repair/destroy a jeep, 7 for a tank. Destroying a vehicle doesn't increase your wrench points, although maybe it decreases at a lower rate than repair. Dunno.
The BFG heals you faster than an assault rifle can hurt you, but a flamethrower still wins.
Put a BFG on a jeep and it'll heal you when you're in the gunner's seat.
BFG takes two rocket/grenade hits to destroy, bastards are tough.
BFG lasts about thirty seconds or so, didn't time it.
You get 2 BFG's per pickup.
You alternate between mines and BFG when you have both by just selecting that direction again.
The 50 cal gun on the jeep can take out a tank in just under a single clip. >
It's got 90 rounds now.
In the server settings, you can choose whether to have the wrench and BFG available or not.
Flag return timer options have been changed to 15/30/45/60/90, and it defaults to 45. I don't like this. :/
Overall, some pretty sweet stuff. Can't wait to see how the voice stuff works once I try it online. I'll probably still stick with PTT.