I want something fun and hip-pop. Something a-la Mihimaru GT or M-flo loves would be good! I don't think 8th gen will be present for this release, and I actually hope they aren't

Although, I don't forsee them doing anything hip-pop for awhile :/
I actually don't think they'll do a ballad either. BUT! I hope they do have some harmonies in this song. They're all strong vocalists. Yossi, Risa, or Miki I think would be best for lower harmonies, with Ai, Reina, and Eri taking on the higher notes. And really anyone can do the basic main harmony. And then Sayumi and Koharu could um.... Do their little sounds that make the song fun like "YAY~" or whatever

Also! Hopefully they'll each get more screen time like they did when they split into the gumi's a few years back.
Or maybe it'll be a double a-side with a nice upbeat song and one as a ballad? Then that could be the reason for the two limited. Johnny's does that sometimes. Look at Tokio. They Had limited for "Do do do" and one for "Sorafune" and then the regular. OH! I hope that's what it is

It'd be exciting, and MM has never really had a double a-side have they?