The Netherland-based dev studio PlayLogic Games Factory is working on an unannounced PS3 title for SCEE, according to an employee's LinkedIn profile. The title is due for a fall 2010 release.
According to the company website, PlayLogic has been working as a first party contractor for SCEE for the past two years. PlayLogic has been assisting SCEE in the development of EyePet, and were also behind Aqua Vita, Tori Emaki and Mesmerize, a series of PSN games that used the PlayStation Eye. More recently, PlayLogic developed Fairytale Fights, for the PS3 and XBox 360.
Given the developer back catalog, and the timing of the release, I would say it's likely they are working on some sort of motion game. Especially considering their close relationship to SCEE, who has traditionally been in charge of the EyeToy lineup.