Dunno. Graphics looked pretty good in the screenshots they released several months ago, better than alot of current gen games:
Bearing in mind that Daedalic is a AA studio rather than a AAA studio, it's possible that the game was actually designed as a next-gen exclusive originally, considering the level of graphics. But it's also possible that it was planned to be cross-gen all along.
Honestly, I disagree with the assessment that this image looks good; it looks quite bad imho.
But like you said, Daedalic is not a studio being given AAA budgets. Either way, unless they are getting another studio to port, or current gen versions are releasing after the next gen version, I still don't think that this is some new decision. It's far too late in development for them to add 3 weaker platforms.
But I could be wrong.