It looks like better versions of 12smart.
Also, my surprised face at seeing Riho center:
NOT.
My real face:
Actual surprise at seeing Mizupon basically center, more prominently featured than both Sayu and Sakura, AND on both editions?
I'm expecting HELLAAAAA lines for Mizuki. She has the perfect "generic" idol voice where it'll work basically everywhere. I think someone in the musings thread said Riho will be more of a signature voice compared to Mizuki and I agree however I'd like to add that I think Mizuki might have the more useful voice. I've said before that Mizuki has a chameleon like voice and she's shown us that she can be paired with Sayu, sing "soft" songs that she likes, but is capable of having a strong voice (like in Wagamama).
I'm honestly expecting her to have just as many lines as Sakura now in the updated songs, if not more.