-The MAV will now be destroyed when running into a soldier or vehicle at high speed. It is still possible to strategically sacrifice your MAV on a soldier; it will be destroyed in the process.
-The MAV can no longer be used as an elevator.
-Players may now use their knife to destroy enemy equipment.
-C4 will no longer be detonable after a player respawns, if the player is revived within 5 seconds he can still detonate his C4.
-The player may now have a maximum number of mines which will persist after the player’s death. Deploying more than the maximum of 6 mines will remove a previous mine from the world.
-Claymores now live up to 5 seconds after a player dies, the player can have a max 2 claymores planted at the same time.
-Claymores can now detonate from vehicles and can be used to disable jeeps or kill the passengers in light jeeps. Claymores will not do any damage to heavy vehicles.
-Ammobags now stay until the user redeploys them like Medkits.
-Ammobags resupply bullets more quickly, but explosives resupply more slowly, especially 40mm grenades.
-The M224 Mortar can no longer be deployed in an area that is out of combat for another team like a home base or other protected spawn.
more here:
http://www.nowgamer.com/news/1299060/battlefield_3_update_huge_104_patch_brings_fixes_tweaks_rentaserver_to_ps3.html