Sure is a good thing I've kept my hopes at a neutral pace. I initially thought Volcanion may get announced this month, and guess what? It did! Now I think early 2016 is best for them to reveal the game(s) now, hopefully through a Pokemon direct.
I feel like Unova has this distinct connection to Kalos in terms of history. In the Parfum Palace, you see statues of Reshiram and Zekrom, giving the impression that those two regions are allies. There's even an NPC in the gardens by the Zekron statue that states "Unova and Kalos must have been in contact with each other." Both regions experienced war, both had some kind of ancient king. Even in ORAS, Zinnia makes this statement,"... Hey... The actions that you're taking now... Are they based on the ideals you cling to? Or are they based on actual truths? And if they are... How much of the truth do you think you know?"
And we know what Truths and Ideals are...
Heck, even Colress himself was referring to Mega Evolutions from the get-go in B/W2. His true goal was to find a way to draw out the strength of Pokemon, which Mega Evo does. In X and Y, a guy on route 10 mentions that "A few years back, this really strange dude named Colress told me that these big stones emit some kind of special energy."
Considering ALL the Megas we have now, ONLY Kalos and Unova are the only regions that have 1 Pokemon that can Mega Evolve, one being Audino, and the other is Diancie.
And... in the timeline, B/W2 takes the same place as X/Y does.
Possibly the only thing we still don't know in Unova is the Original dragon, where did it come from, how was it relevant to the history of Unova, and how powerful is it? It could be that we might never know about this Dragon, but it's still nice to know after all these years. In the coding for B/W, they had the "God Stone" which was related to the Dark and Light stones, but NEVER was used in the storyline for B/W and B/W2, and was forever useless ever since
I don't know what surprising things they'll do to make even more connections to both those regions, but I'd like to see something interesting to "Z", (It seems unlikely, but maybe going back to Unova to work as a Johto 2.0?)