While looking at new pictures from the trailer, i noticed some things. First, the X legendary, Xerneas, looks quite similar to the muskateer quartet of Unova. If Unova was like, Kanto 2.0, who's to say that this new region isn't Johto 2.0? Lugia led the legendary birds, maybe Xerneas leads the muskateers. With that being said, the Y legendary, Yveltal, way have a hand in the creation of some legendary pokemon. Just a theory, but, highly likely.