UPDATE: Dwayne Johnson fully confirmed this casting today via Twitter, saying "It's official: Call the Pentagon, get me my big ass gun - Rocks a JOE!." The original article from June 6 follows (with edits removing the then rumored title of "Cobra Strikes.") Next summer's sequel to G.I. Joe: The Rise of Cobra now has a major star. Variety is reporting that Dwayne "The Rock" Johnson is in ...