There will be no co-op or multiplayer in Marvel’s Guardians of the Galaxy game. Square Enix handed this project off to Eidos Montreal, who stated that they did not intend to make it co-op or multiplayer.
This was revealed shortly after the game was announced. Guardians of the Galaxy’s Senior Creative Director, Jean-François Dugas, said in an interview with IGN:
It’s a bit of a heartbreak for many fans of the game, but the quote above explains its reasoning. Marvel’s Guardians of the Galaxy appear to be taking a different approach from Marvel’s Avengers.
For more info on Marvel’s Guardians of the Galaxy Game, check out Can I play as the other Guardians in Guardians of the Galaxy? on Pro Game Guides!