Alot of interesting info over the last couple of days:
from the gamesport play through we have seen the bikes (fast, can jump walls, but vulnerable), tanks (with rocket + bomb launcher thing + can carry passenger on top out of hatch as per warhawk), dust 32 player map, new weapons, new improved audio, new melee 'drama' kills.
We have heard how they have implemented the option later to be able to potentially have different loadouts for vehicles (so a jeep with a 50cal gun, or rocket launcher attached)
buildings are now color coded with a kind of team color aura, holograms next to build and battle buttons, reclaimable turrets
from the IGN vid we have seen a evening/night time co-op match, turrets (of laser turret size) that fire rockets