Finally, a Raven pet is being introduced, can't wait!
Thanks Blizzard! (Yeah I know I'm easily pleased)
It will be awesome for my Lock.
Much as I'd love it to be for getting exalted with Gilneas (as lets face it, the horses are so boring you might as well just buy a +1 to your mount collection) but I'm going to guess it will be a pet you capture with the new battle system.
I guess this is a good thing as, lets be honest, it would be a bit mean to add a crow/raven pet to the game and not let undead warlocks amongst others have it.