Hmm.... Seems an odd place to post this at but okay.
The game obviously will be a side-story game... When I looked at the Pikachu there, I knew it that this game is a spin off game.
The game also can be Pokemon Z or Pokemon X 2 and Pokemon Y 2. There have been rumors though that the next region will be in generation five. If you want to know more about it, this video is perfect.
http://www.youtube.com/watch?v=TJU4yY5r0K0