I'm assuming it's also going to be a Five Stars show, in which case, I envision them doing what they're currently doing with C-utes' show... One permanent host (Nakky) and the other girls rotate for a couple episodes each. Although, I swear it seems like Chisa's been a guest more than anyone else!
So with Momusu, it could be one or two girls as permanent hosts and the other girls rotate... minus Sayumi. I don't believe Sayu will be taking part in this show as she currently has a regular gig with another station, and even though you might argue that she's also got the Yantan gig, other than maybe a guest spot, I don't think she'll be any kind of regular on this new show.
And if it is indeed in the Five Stars line-up, they'll likely keep it to a half-hour show.