I imagine they will, considering it's the same generation. Pokemon models in battle will most likely be reused with small edits. Maybe flying pokemon will get standing models if sky battles don't appear. Tropius and Skarmory desperately need to put their feet on the ground.
I don't know but I do get your point there. The one thing I really want to see is the return of Contests and maybe they'll actually be better than the originals (I hated how you could potentially lose points).