EA's Origin Website is now offering a free copy of Battlefield 3 with preorders of Mass Effect 3, BioWare's upcoming action/RPG sequel. This seems to cover both the standard edition for all platforms and the PC-exclusive digital deluxe edition.
This offer doesn't seem to be worldwide. The german store only mentions in-game items (3 weapons, 1 armor; the amazon preorder has 1 weapon, 1 armor) as a pre-order bonus.