We basically have 4 days to find out and it is about time for the Leak.
As I mentioned in the Legendary thread, I don't mind Yveltal being Dark/Dragon. Doesn't look like a Dragon at all, but I don't mind it. Also they don't have to be Flying type to fly. Look at Garchomp, Beedrill, and Hydreigon.
True it could have levitate like Hydreigon...which would make it a better Hydreigon if it has a good stat distribution and as good a move pool as it...
The pokemon seem odd though, a different style from the rest.