I just want to state my opinion.
I don't think those are in-game pictures, just for hype. However, if they're in game, sweet.
These are in game models. 2K has confirmed this. These aren't cut scenes or anything like that.
Again, they are using the same technology for character models that they used on NBA 2K14. NBA 2K14 is considered the most graphically impressive sports game to this date. WWE 2K15 will only improve on that. I'd also like to mention how good EA Sports UFC looks. The Create a Fighter mode is shit, but the actual models in game look awesome.
We are approaching the era where actual in game footage can be confused as a cut scene. I was guilty of this while watching clips of Arkham Knight.
It's a good time to be alive.