Insomniac Games have registered a trademark called Sunset Overdrive.
It could still be something that they plan on making in the future. It sounds like a racing game based on what it is called but Insomniac have never made games like that before.
The trademark was filed in February this year and based on the filing time, the game could be long ways off. They are currently making Fuse for PS3 and Xbox 360 and with EA doing the publishing duties.
It’s not clear whether they will go with EA again for this game but it’s too early to think about that since it could just be in the concept stage right now.