Hey...this looks like a major improvement from the first one so far: It looks like there is going to be a decent and interesting plot, heroes are actually helping each other confront a threat instead of fighting each other, focus appears to be placed on three heroes representing each franchise (Wizard, Gobusters/Gokaiger/Kyoryuger and Gavan), no forced "All" aspects...yet (Oh please no).
I believe Gavan is attacking Wizard because the Space Police has been secretly taken over by Space Shocker and Geki has been tricked. He doesn't know his superiors are Space Shocker people yet. He believes that he is on another mission to save Earth.
I think Sota will come back to voice Fourze as he seems to get some big scenes.