Ultra Sun/Moon is for 3DS as is probably going to be the Gen 7 analogy to Black/White 2: same world (maybe some new places to explore) but different story and probably different Pokemon and probably some new game feature.
We'll have to see if that turns out an improvement (still disappointed they never gave us the "Z" version Gen 6 needed to fix things like the crap difficulty curve. And thus the Gen 6 legendary got any story-relevance pushed into a Gen 7 sidesquest :P )