It has happened once again. Someone's CV made mention of an unannounced title, and in this case it was the next project from Harmonix targeted for Xbox Live Arcade, Playstation Network, and Facebook.
And once again it was Superannuation, who came up with the information. Harmonix made a humorous comment about it on Shacknews:
"We're excited to confirm more information soon, probably via a LinkedIn update or something - we haven't decided..."