Read this last night: The Rock has met with Warner Bros about something connected with DC Comics and the article contained this paragraph:
The Rock was previously connected to the role of DC Comics villain Black Adam in a proposed "Shazam" film, dating back to 2007. In July 2012, he tweeted that he was "possibly playing" another DC character, Lobo. And of course, there's the 2015 "Man of Steel" sequel, which still hasn't announced any villain role -- and could possibly add another hero alongside Superman (Henry Cavill), Batman (Ben Affleck) and Wonder Woman Gal Gadot).That last line made me instantly think - the Rock would be perfect (physically at least) as J'onn J'onnz, Martian Manhunter who appears at the end of Superman vs Batman as a lead in to a Justice League film.
Meet back here in a couple of years to see if I'm right.