It will air in Japan in late July, and usually the movies air in the US around December. But since they are releasing the new games worldwide before December, I wouldn't be surprised if they released it earlier to make it more relevant.
EDIT: And if you want to see any of the new movies, I'd suggest Black-Victini and Reshiram/White-Victini and Zekrom if you can find it. It comes in a double pack and it is probably my favorite Pokemon movie since Pokemon 2000. And Kyurem vs. The Swords of Justice just released on DVD the other day to my understanding (haven't seen it yet). --- White FC: 4727 7422 4019 Platinum FC: 2063 5286 9480