Battlefield 3 @ E3 2011
Vehicles in Battlefield 3 have two new features. First is they now have regenerating armor. If it goes down below a certain threshold your vehicle will be disabled (you will see sparks) and not being able to move, although the turret can still move. Vehicles as well as soldiers are now fully customizable. In the demo, the LAV-25 has the main gun, an added a coax cannon to take out infantry and added thermal vision.
Speaking of LAN, I was told there would be no LAN support.
EA had also told us that knifing from the front is possible, but not an instant kill. I was also told you can pull out the knife (possibly the #5 slot) and not have to use quick knife.