Nick Doerr of pspfanboy.com says:
If you've been an avid PSP Fanboy reader, or an avid LocoRoco player, you might remember our downloadable demo last Christmas. Seems we're getting another treat this year as well, as it appears a demo with Santa Blob Person is on its way. The SCEJ website indicates a December 13th date, and availability on the PSP and the PC's version of the PlayStation Store. Or, you know, you could just get it from us. We'll get back to you on this subject in a little under a week.