VidRhythm, Harmonix's first new IP since Dance Central, is an iOS app, the Rock Band developer has revealed.
"The VidRhythm project has a tiny team that's doing our very first project in this space," he explained.
He was unforthcoming on precise gameplay details but apparently it's more of an app than a full game.
As discussed earlier this month, the studio is in the midst of a creative purple patch following its split with former owner Viacom. As well as Dance Central 2, Rock Band DLC and VidRhythm, the developer has a number of other secret projects in the oven.
"As we've been in development on Dance Central 2 we've also been in development on a bunch of new ideas," exec Tracy Rosenthal-Newsom told Eurogamer.
"It's just been terrific to see the company get back to the core collaborative design process that we have putting small games together, making prototypes and thinking up really innovative gameplay. We're super excited to see what comes of that in the future."