User blog comment:Bovell/Lots of new Battlefield 3 details via Twitter, DreamHack festival, PSM3, and interview/@comment-70.30.55.73-20110625220244/@comment-4092510-20110627042149

Well you can disable vehicles so the enemy has a chance to get out before their vehicle gets destroyed. You can still use your vehicle while it's disabled but it will probably be annihilated quickly since it's immobile. Maybe the regen is only for disabled parts and the vehicle will be disabled when health is really low. I don't know thats my guess.