5TH Cell's next game uses the Source engine
Slaczka wouldn't confirm or deny whether this is the XBLA project mentioned last year. But if it's using Valve's FPS-friendly Source engine, it's unlikely to be a DS game — and it's unlikely to be Scribblenauts. As for when we can expect to learn more about this mystery project: "Hopefully we'll have something to show people in a few months."