"For example, if after Black and White we came out with a grey, people would have been expecting that," he said. "Same thing with X/Y and having a Z straight afterwards. So we're always just trying to surprise people."

"One of the main appeals of Pokemon over the years is the concept that even through all these games, you can have people 20 years apart but they can still talk about Pokemon" -- Masuda. Another driving factor in working on the remakes is that it's what fans want, Masuda said.

"There's been a lot of demand from people to remake Ruby/Sapphire on social media, for example," he said. "Right now really felt like a good time to do it, and instead of doing a direct sequel to X/Y we're tying it together in some unique ways."

That last sentence. Means no Z, no X2/Y2 or ZX/ZY because that would be the same as X2/Y2. What's going to happen with Kalos?

http://www.gamespot.com/articles/pokemon-director-explains-why-series-is-becoming-e/1100-6422945/