Board Thread:News and Announcements/@comment-11148831-20150327141150/@comment-6604690-20150414152030

It'll be more likely the new cast will have different seiyuus, I mean some of the seiyuus of u's are gonna do voice acting in other anime and projects. (now that they're known for voicing u's)

My guess is that Sunshine will take place either immediately after the movie(might coincide with season 2) or after(hopefully not) u's retirement as an idol group.