Collector's Edition pet is the mini Deathwing. No big surprise there.
Raider mount is a "Storm Drake" (photo). Not all-inspiring, but decent enough.
I think I prefer the 5-man mount: "Volcanic Stone Drake."
Aw, who am I kidding? They're both great and good luck to everyone who wants one! I'm quite happy that the raids will be shorter in Cata. I might actually complete them all on Dusty and have a shot at that raider thing. Not that I'll use the mount. But it's nice to have the chance to achieve something.