According to this year’s 33rd issue of Weekly Shounen Jump magazine, a new animated film based off Toriyama Akira’s manga series, 「Dragonball」, is currently in production. A countdown site was also launched in promotion for the new project.
Manga-news.com reports that original manga author, Toriyama Akira, is deeply involved for the first time in the anime series. They also mention a possible premiere date of March 30th, 2013.
[UPDATE 07.15.2012] – The story takes place between chapters 517 and 518 of the original manga — after the end of the Majin Buu battle.