Announced in Shonen Jump issue 33, A new Dragon Ball Z movie is due to release in 2013. The movie, which is being co-written by Akira Toriyama will take place 10 years after the Majin Buu saga of the Dragon Ball Z anime and it will be written in as part of the official timeline between chapter 517 and 518 of the manga.
The poster, included in Weekly Shonen Jump #33 lists
http://www.dragonball2013.com/ as the official website for the movie along with a short message from Akira Toriyama:
"It’s rare, or I should say, it’s the first time, that I’ve been deeply involved with the animation from the scriptwriting stage.
It had been a while, so there was a lot I’d forgotten, but as expected of the creator of the original work, I was soon able to get back into the tempo of things, at least.
For this film, while leaving the atmosphere of the original intact, we’ve added just a little bit of modern flavor, so I think it will be an enjoyable work of entertainment, just like old times".