Where can you watch Pokemon movie 12?

If you check serebii.net then go to enter site on the right you will see a small window and it will say Pokemon movie 12 arceus July 18th in Japan no one knows Accept the guy who made Pokemon when will it come out in English and heres the trailer for it that's traslated YouTube.com/watch?v=xOYdHi-bKKw">http://www.YouTube.com/watch?v=xOYdHi-bKKw