The difference between Idolmaster and Project Diva though is the sheer amount of content. True, Project Diva has a lot of songs and multiple singers for each too, but the sheer breadth of voiced content in all the events, lessons, story sequences, IUs, rival auditions, etc in SP is just breathtaking. Not to mention the costume mapping, even if they did cut the number of different base models down considerably for SP.
That said, chances of us seeing an im@s on either 3DS or NGP is pretty high, I think. 3DS could be interesting and the series kind of lends itself to giving a bit of kinetic feeling to it's dances via the 3D, but it's more likely we'll see an NGP due to the success of SP and the flop that was Dearly Stars, much as I love it.
ib4 doujin game etc