Incomplete patch notes were posted on Battlelog. The list is quite long, but here are high(low)lights for me:
-No longer able to detonate C4 when you respawn

-MAVs are destroyed if they run into objects/soldiers with enough velocity (may still kill soldiers)
-MAV-lifting is gone
-Fall damage eliminated for short drops
-Flares no longer break a lock-on but do protect against laser guided missles
-Stinger/IGLA lock-on quicker and disable aircraft with one hit-Frag round effectiveness has been reduced
http://battlelog.battlefield.com/bf3/news/view/2832654779195992365//