As other said the main Unova Arc is about to end that doesn't mean we are close to the end of this generation. My personal believe is that they will run the N arc until Movie 16 and have the movie correspond with the series since N is in P2 lab and they have shown scans dealing with Genesect. So maybe they will show new Pokemon, but that doesn't mean a new generation is about to occur since Kecleon were seen in the middle of the Johto Saga. And Ho-Oh and Togepi early in Kanto Saga. So after Movie 16 in July maybe will be getting some hints(especially if they release a new Eeveelution on the Eevee and Friends short).