You will probably need to be a fan of Dragon Ball in order to get really excited about this upcoming movie and to be fair there are quite few so this first teaser trailer be worth looking at! In fact, just watch it anyhow, because it is classic Anime at its finest.
According to the Anime News Network, they are saying that the film;
“is set between the 517th and 518th instalments of Akira Toriyama’s original manga. Specifically, it is set during the “lost decade” of story time after the end of the battle with Majin Buu. Kuririn, Piccolo, Vegeta, and other familar characters will appear in the film. The film is not a spinoff, but a story in the official history of Dragon Ball.”
Source [Geeks Are Sexy]