I'm not quite sure what gen 7 will be like exactly, other than I hope it won't disappoint me, like ORAS. These games are getting too easy.
I'm pretty sure they won't be evolving pokemon from previous generation, since this has only ever happened in the even number gens, there was no evo's for previous gen pokes in 3 or 5, so there probably wont be in 7. I would really like the region to be based off Africa or China, even though I'm a huge fan of Japan, there's too many based off there. I also think that these two places would give a different feel to the games, however they would probably make it feel the same. I would love for there to be less huge, techy cities and just some very small villages and towns, maybe even get rid of pkmn centers and just have like, a village mage or whatever to heal your pokes. I would also like a deeper, more developed storyline, like what you see in other JRPG's, such as Final Fantasy and the Tales of series. Finally, even though it is obvious they would never do this, I'd love it for them to go back to gen 5 graphics (sprites and stuff), cos honestly, I thought the sprites in battle looked so much better than 3D models, it just suited pokemon more. As well as all this, a completely different idea, maybe something to do with the stars and constellations?