M11
Gekijōban Pocket Monsters Diamond & Pearl is the working title of the 11th Pokémon movie. It was first revealed in a teaser trailer shown at the end of Dialga vs. Palkia vs. Darkrai. The film will be released sometime in 2008.
The teaser shows Regigigas's hand rising from a large flowery field. Because of this, it is expected that Shaymin, the next unobtainable legendary in the National Dex, will have some involvement.