Movie 3 will be out this summer, and appears to be about bombs planted at the police station. I hear that Aoshima has been promoted, so he's in Uozumi's old position. There don't seem to be many people coming back, so that's really sad. I think just Aoshima, Sumire, and a girl who was in one of the TV Specials.

BUT!

Waku may not be returning, but one of the main characters is going to be Waku's Nephew. I think that has a lot of potential there.