Yeah, there is going to be another Dragonball live action movie in theaters. Not sure when, but it is official. There's even a section for it on DBZ.com!
In news totaly unrelated that you probably don't care about, I'm getting an Xbox 360 next month, and play DBZ Burst Limit and Halo 3 a milion times over in one month. I'm also saving up for a Wii. I'm at about $195 so far, and still saving up more. Again, you probably don't care, and if you read all that, you're probably thinking, "what a waste of time that was." I'm going to go to the garden to eat worms now. :D