I don't believe the game arrives until 2019, so it still has time to look prettier and to get more ambitious in terms of design. However, the final product may wind up exactly as you fear. I think fighting games have reached a point where--at least with current hardware--they're unlikely to look much better in ways that draw attention to themselves. And a lot of developers don't have the resources to push hard against those barriers, unless someone like Sony or Microsoft is paying them to do so. Koei Tecmo and Team Ninja aren't currently in that position with Dead or Alive 6, as far as I know.
"Too often we enjoy the comfort of opinion without the discomfort of thought." - John F. Kennedy on reality
"What if everything you see is more than what you see--the person next to you is a warrior and the space that appears empty is a secret door to another world? What if something appears that shouldn't? You either dismiss it, or you accept that there is much more to the world than you think. Perhaps it really is a doorway, and if you choose to go inside, you'll find many unexpected things." - Shigeru Miyamoto on secret doors to another world