I don't see them every going playable, honestly. Their culture is a bit too isolationist, I think. Also, they're so Norn-like, it would be odd to have two arctic-dwelling giant/bear races.
I'm still hoping one of the truly alien races becomes playable, like a friendly centaur tribe, the Forgotten, some of the liberated Dredge slaves, etc. Though I'm sure I'd be the only one waiting in line to play as a Harpy. :)
Tengu are popular though, right? As are Quaggan. ^^