After consideration, I don't think that we will see it in these games. If anything, I see Unova making an appearance. It has a lot of ties to Kalos, so it seems much more likely. Plus, I think that they may be listening to what a lot of people have been asking for. They even responding to someone about it on Twitter, or some other website iirc. If they were to only include it in these games, and not give it its own fleshed out remake, I think that a lot of people will get angry. Especially those gen 3 fanboys. They will probably take it, but they will end up being disapointed with it.