Neat, and I see Pokemon Amie is back too.
On the downside, trainer customization is gone, so no skin color and clothing changes/etc. Disappointing.
usgamer.net/articles/so-does-pokemon-omega-ruby-and-alpha-include-trainer-customizationDuring an event last week, Game Freak's Junichi Masuda confirmed that trainer customization had been removed from the upcoming remakes: "In terms of the customization of the trainer, that was really kind of a special thing for the Kalos region, which featured this kind of motif of France and really focused on this beauty and fashion aspect, which is why it was a prominent feature in that game. For this game, we're focusing on adventuring elements, so we don't have the actual free customization of the trainer, but you'll see the items you use throughout the game visually represented; for example, when you're underwater, you'll have this little mouthpiece that lets you breathe. So there's some cool stuff for how your trainer changes clothes and puts on accessories throughout the game."
Also from Serebii:
It has also been confirmed in an interview with NTower that, although X & Y are compatible with Omega Ruby & Alpha Sapphire, X & Y will not receive a patch to include the new Mega Evolutions and Primal Reversions.
I guess X&Y users can't battle with those using any new Mega Evolutions in OR/AS then...