The much “anticipated” (thanks to the non-resolving cliffhanger of the series) movie of Kamen Rider Decade, which served as the purpose of telling the last chapter of the Kamen Rider Decade’s story, has been in the Japanese cinemas since 12 December 2009. Its DVD and blueray will be available at May 21, 2010:

Source: Toy World Forum

More info: amazon.co.jp

However…

If you didn’t get to watch the movie in theaters (eg cant go to japan) , and you are very eager to watch it now, actually you can watch it online now. It was recored by someone inside the cinemas and uploaded to a chinese video sharing site:

Decade, Last Chapter:

W, Begin’s Night:

Movie Wars:

Source: Toy World Forum

Well, for the best movie experience, better wait till its DVD and Blueray come out…