Amazon, Direct2Drive, GameStop, and Steam (and presumably other e-tailers and retailers) are now offering pre-purchases of a Battlefield: Bad Company 2 Limited Edition, which offers the six perks in the military shooter sequel announced last October. These are an Up-armor package mounted on all vehicle types, additional weapon packages for the driver of all armored vehicles, a Vehicle Motion Sensor, a Tracer Dart Pistol, an M1A1 Sub-machine Gun, and the M1911 Pistol. A FAQ released following the announcement of the LE explained that these perks are early access to multiplayer upgrades, which must be unlocked by owners of the vanilla edition. The two editions are the same price, so this is meant as a pre-purchase incentive. There is also an "online disclaimer" on the Steam page for the LE with two notes we haven't seen before, saying online play will require an account with ea.com, and that online access to the game is "non transferrable." Here's word, apologies for the shouting:

ACCEPTANCE OF END USER LICENSE AGREEMENT REQUIRED TO PLAY. ACCESS TO ONLINE FEATURES AND/OR SERVICES REQUIRES AN EA ACCOUNT AND REGISTRATION WITH THE ENCLOSED SERIAL CODE. REGISTRATION FOR ONLINE FEATURES IS LIMITED TO ONE EA ACCOUNT PER SERIAL CODE AND IS NON-TRANSFERABLE. EA ONLINE TERMS & CONDITIONS CAN BE FOUND AT www.ea.com. YOU MUST BE 13+ TO REGISTER FOR AN EA ACCOUNT. EA MAY RETIRE ONLINE FEATURES AFTER 30 DAYS NOTICE POSTED ON www.ea.com.