UPDATE: It has been confirmed at the Game Awards that Telltale is making Guardians of the Galaxy.
Today, SAG-AFTRA, the largest union for voice actors and stunt performers in Hollywood updated their list of projects that aren’t being struck, and it includes a large number of unannounced projects namely Guardians of the Galaxy: The Video Game being developed by a production house with Telltale’s The Walking Dead: A New Frontier. Assuming from this, Telltale may be working on a Guardians of the Galaxy game.
While nothing is confirmed it doesn’t mean an unannounced title is being developed inside Telltale’s studio.