Well, what do you know! We figured that worgen and troll druids would just get recolors of existing druid flight forms, but it looks like we were wrong. The latest Cataclysm beta patch added a brand new Swift Flight Form model for worgen druids, so it's safe to assume that trolls will have one soon as well.
I'm liking the Gilnean flag on the back of the form, as well as the serrated beak and big feathery mane. Wonder what kinds of touches the troll form will get? Guess we'll have to wait and see! And hey, maybe this means we'll see new moonkin forms too. A dog can dream.