For pre-ordering the game, you get two extra modes: Dog Fight (an aerial battle mode) and Mad Survival (Horde mode), as well as one other huge bonus -- Bayonetta as a playable character. Dog Fight sounds like a minor distraction involving helicopters and guns, but Mad Survival sounds like a required experience -- I can't get enough of coop gametypes.
It kind of sucks that a marquee character like Bayonetta isn't included on every disc, but that's probably why they did it, right? Right now the only confirmation for this bonus is in the UK, but I can't imagine the US wouldn't follow suit.
[*].disqus.comto your security software's whitelist.