11th Pokemon Movie Preview!
Here's a picture of the 11th Pokemon movie preview shown at the end of the 10th Pokemon movie that was shown in Japan. The 11th Pokemon movie preview shows Regigigas' hand emerging in a field of flowers, which suggests that Shaymin might have some involvement in the movie.
I want the 10th Pokemon movie released in the US as soon as possible, though it might be a while. When the Pokemon Ranger movie (9th movie) was released in Japan in July 2006, it was released in the US in April 2007. The Dialga vs. Palkia vs. Darkrai movie (10th movie) was releasd in July 2007. So that's simple, following that pattern, we can expect somewhere around April 2008. But of course, almost anything can happen, but that gives you a basic idea on when to expect it (like don't expect it next month).
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