GameStop Power-Up Rewards members who pre-order Battlefield 4 can unlock some vehicle upgrades in Battlefield 3 immediately. The Air Vehicles Shortcut Kit instantly unlocks all 38 upgrades across all airborne vehicles in Battlefield 3.

Looking to go through a different retailer with your early commitment? AllBattlefield 4 pre-orders will also receive the China Rising expansion: a collection of four maps, weapons and tech. Battlefield 4 is slated for October 29 on PC, Xbox One, Xbox 360, PS4 and PS3.
http://www.joystiq.com/2013/06/04/ga...ield-4-pre-or/