>>57710570X&Y was an apology game from gamefreak. The community hated Gen 5 so much gamefreak felt the need to regress and make the games more simple like Gen 1, so the genwunners didn't cry again. It's why it lacks content, and has a lot of Kanto references.
Isn't kinda odd gamefreak has been pushing out a lot of Unova stuff lately? It feels like they really wanted Unova to be the new Kanto that connected to Johto, Hoenn, and Sinnoh.