Thus far, two "exclusives" have been revealed:

Those that pre-order the PlayStation 3 and Xbox 360 "psychological warfare" game from GameStop will net an in-game "Slasher Bear" outfit, complete with a "fearsome goalie mask," while those that pre-order from Amazon get a "Freddy Kruebear costume" and accompanying "razor sharp claws."

Of course, given that the game isn't out until June 2010 and the companies have unveiled one such pre-order bonus per day this week, you may want to hold off on pre-ordering until everything have been revealed. Until then, some trailers of the outfits: