The turning rate for jets when doing horizontal turns has been increased which (it's important to note) doesn't affect the nature of dogfighting between competent pilots, attack helicopters have better mobility now and can do perfect circle strafes and the rockets for both AHs and jets are easier to aim so while they're more vulnerable they're significantly more lethal now so essentially the top heli duos are even stronger now while the average duo is weaker. The M416 replaces the M16A3 and the HMG for MBTs replaces canister shell and the animations in general have been improved. As long as jet physics remains roughly the way it is right now in BF3 DICE has my money for BF4.