No one knows yet. A lot of people are hoping for a 5th generation. But they can't really top this one, since they've got the Pokemon that was said to create everything. Can't really top that.
Nothing is known yet. It's all just speculation. Some people are saying that Dialga, Palkia, and Giratina will be fighting and Arceus will show up to stop them from fighting and Heatran will only make a brief appearance like Regigigas did in the 11th movie.
