So this doesn't really dovetail with any current conversation we are having but a commenter on Pokebeach noted that the 100% form of Zygarde looks like an A--so my guess has become that we will get a Pokemon A and a Pokemon Z game. My theory as to how that would work would be that Zygarde gets its 100% form (which of course already exists) and an enhanced 50% form (which of course does not seem to exist yet).