For now, Marvel is believed to only be shooting scenes for Doomsday, with the timing of Reynolds' post strongly suggesting he's set to return for that, rather than later down the line. Indeed, some fans are eagerly anticipating a second big reveal of Avengers: Doomsday cast members, perhaps via a second set of chairs, as production continues.

A cryptic new Instagram post from Ryan Reynolds has fans speculating that the actor could be returning as Deadpool in "Avengers: Doomsday."

Ryan Reynolds shares a cryptic post that suggests Deadpool may join the Avengers in upcoming films, fueling excitement and speculation for 'Doomsday' and 'Secret Wars'. Discover what this could mean for the Marvel Cinematic Universe!