Sweet, Sony's really trying to get the PSP figure sales up with other games as well (yay LittleBigPlanet!) Let's hope it saves the PSP this year.
Although I would like to learn how rockband would actually be played on the psp, I have to say, things are looking pretty good this year in terms of psp gaming, which is pretty great, considering it came out about 4 years ago.
Slap on the Rockband name and you've got yourself a high selling video game. And since Guitar Hero has dibs on the DS, Rockband had to go on the PSP. And then, when the creators lose control of Rock Band, like the did with GH, they will create a third band type game and when that becomes successful, it will go on Microsoft's portable gaming device.