I imagine we'll reach the end of the manga before they announce anything more, honestly. Or maybe it's time for the next big movie? Might explain the lull in activity? Just hopefully it's a decent one, should that be the case.
*waits for it...*Coming this summer, the sequel no one wanted to see! *cut to house interior* I AM MUTEN ROSHI!! In a world where we've already closed off this nightmare of a storyline that made no sense and featured actors who looked more like they were constipated than fighting in martial arts scenes comes the epic conclusion to the already concluded first movie. Goku did things, farted with his hands, got the girl and beat the slug man. Now watch in awe as he beats up a monkey man from outer space and bald body guard. You won't believe how many hand farts are in this one! Passing wind this summer. Dragonball Evolution 2: Evolution Harderer.