I too would say it's a wolf, seeing as it has to do with norse mythology. Sure, we do have bobcats up here but they aren't as connected to our "old ways" (if you will) as wolves are. With that said, I do think the snout is too short to belong to a wolf.
I'll add that this teaser is one of the better ones, that has recently been released, in my opinion.
I wonder how long Marvel can call All New X-Men by that name. Sure, it works if they keep a rotating roster like with Uncanny Avengers OR if they replace ANX with a new X-title in a year or so.
And I'm happy and sad at the same time that Kurt won't be included in the time travelling. Speaking of, won't a time travelling X-team disrupt the time stream or whatever? Has it been stated that the team will be from 616 or are they from a near identical alternate reality?