Principate
Saint Titanfall
I hope that cross-gen doesn't mean that the current gen versions won't have awesome visuals. Regardless I hope the game is a less janky than MK 9.
I honestly don't think one will be a greatly limiting another or much of a limiting factor at all. The only reason it would be would be due to a total lack of effort. Pretty difficult to imagine gameplay mechanics or scope within such a fighting that last gen wouldn't be able to do even if it was next gen only. They could completely alter the visual style and the game could potentially play the same without too much issue since it's pretty much just backgrounds and character models etc.
This seems more of a symbolic annoyance than anything since I really don't see what being nextgen only would meaningfully add only the developer just did a straight port of the last gen version.