Apparently the same people who did 'Princess on Ice' are also doing Rockin Pretty
, a DS game also featuring four girls and rhythm gameplay, except this time they're supposed to be a band instead of figure skaters.
Oh, and apparently they figured out that the anime version of their graphics looked much better, so even the English version gets that now.
However, SOMEBODY in marketing appears to have screwed up, because most of the websites mentioning the game are displaying the screenshots for "Family Pirate Party" under the name of this game. (This includes gamespy and gamespot). Actual screenshots available at the publisher's website.