Speaking to VideoGamer.com at Leipzig Games Convention 2008 Sucker Punch Game Director Nate Fox hasn't completely ruled out the studio making a PSP game in the future.
When asked if the studio has looked at the PSP as a platform for future games Fox stated that "Right now we're working on the PS3". Not much to go on there, but Fox did reveal that he's a big PSP gamer.
"PSP is pretty exciting," he told VideoGamer.com. "I spend a lot of time on the bus, so it'd be nice to contribute to gamers around the world who also play games on the bus."