The ESRB lists them as the publisher for the upcoming "Groovin' Blocks", which is presumably a mini and seems to be a port of a WiiWare/iPhone title.
Interesting (much more than the game, which seems to be yet another music puzzler, that's like 3 of them in the works but not released yet) that SOE is getting involved with the PSP again.
When it first launched, they supported it pretty okay (Untold Legends and Field Commander, most notably), but then quit like 3-4 years ago. Always seemed odd, Sony having a game software company that didn't support its platforms. But maybe they are starting to again? Even if it's just ports of WiiWare/iPhone games, it's something.