Team Z2,you could add the DB supporting cast in the audience at the World Tournament arena stage.
Seating in a row maybe watching the match.Example:Launch,Bulma,Master Roshi (even though i get the feeling you'll make him playable at some point,maybe),
Yamcha's cat friend/companion and so on.Just an idea to have a small easter egg and maybe give nods to DB
And as far as i know it's still in the making.
Tell me if you like it or hate it,i don't mind xD