There's also a website registration for sunsetoverdrive.com by Ryan Schneider, who is the marketing director over at Insomniac.
We've followed up with the company for comment.
Update: "As you can imagine, we're an idea factory and we submit for trademarks pretty regularly," a spokesperson for Insomniac informed Joystiq. "There's nothing to announce, but thanks for checking in on it."
No problem, Insomniac. No problem at all.