It seems the guys over at OffDutyGamers managed to get ahold of the developers who are working on Battlefield 3.
This is what they were able to get out of them.
- Squad Leader confirmed, 4 Person Squad
- Ability to spot a Enemy Squad Leader
- Equippable Grenades
- Falling debris from destruction 3.0 can kill players!
- Equippable knife as well as quick knife (like BC2)
- Support class able to mount bipods and give ammo
- Rifleman class has medpack + defibrillator
- Ability to change fire modes in multiplayer (semi/burst/auto)
- Regenerative health in MP, but suppression effect stops regen (only regen when you aren’t under fire)
- Suppression effects from LMG, blur vision
- Flashlights can blind the enemy
- First Person Animations in Multiplayer
- Faction Specific Weapons + Unlocks
- Vehicles can be immobilized before being destroyed
- Able to opt out of Revives in Multiplayer
- 3D spotting