Hope it sounds like something off of Namie's Play or Queen of Hip-Pop albums. Some lovely sax over something like Funky Town, Can't Sleep, or Want Me Want Me would be hot.
Of course, I won't actually expect that, and will likely love whatever it is.
Wouldn't mind to hear them cover Iku ZYX, modernized.
according to this strange Korean CD store, it looks like Juice=Juice's major label will might be Hachama, and their distributor is Pony Canyon. currently the same as Smileage. means that they won't have the better label and promotions as Zetima and the better box sets from Sony Music in the near future.
their Major Debut single is a triple a-side? "Romance No Tochuu/Watashi ga Iu Mae ni Dakishimenakya ne/Samidare Bijo ga Samidareru", 6 editions. release is 8/21, the same as AKB48.
Knowing that Aina left, it'll be likely that they have to rerecord their debut single If they were to debut in August, it gives them perfect time to replace her.
There's no rule that says you have to remove a former employee from all your promotional material, so they don't HAVE to change the single at all. Anyway, even if they choose to, it's been shown in many a making-of that they record all the parts separately and mix them later. So they wouldn't have to re-record. just remix.