JEFusion is reporting that it takes place during a "lost decade" in the story after the defeat of "Maijin Buu". The trailer embedded below features loads of CG, and I have no idea is that's consistent with what they plan to do in the finished product. You never can tell with these anime trailers.

My wife was big into Dragonball Z when she was in grade school. I never got into it until she and I got bored with too much money and started buying the Dragon Box DVD Collector's Sets, which included the original Japanese audio, retranslated subtitles, and no edits...and loads of filler.