Well it's official that atleast one of the albums will have MUSIC♪. The track list hasn't been released yet but my guess is that it'll be in "THE iDOLM@STER HISTORY" while each of the other Shiny Festa songs will appear in each other album.
BTW, the iM@S History album is only one disc while the other three are two discs. I'm just praying that they'll do something like a limited edition that comes with a DVD/BD of the Shiny Festa OVA. The PSP/PSVita screen does not do it justice.
*ADDITIONAL INFO*
Looks like they've started another popularity poll for iM@S:CG. And this time it seems that they're going to take the top ranking idols and put them into a unit to release a CD.
Last time Airi Totoki took the trophy, who will win this time?