I'm not sure what MI:GP's worldwide release schedule looked like but Skyfall has yet to open in Japan (12/01/2012), Australia (11/22/2012), New Zealand (11/22/2012), South Africa (12/30/2012) and China (TBD).By Sunday, Skyfall should be around $400M OS. If the territories listed above only made $100M combined and Skyfall stopped earning anything in all other OS markets then the film will still make $500M OS. A U.S gross of 180M or more added to $500M OS means that Skyfall will just about match MI: GP. Given that Skyfall will not just abruptly stop making money in already released markets, I think $725M to $750M WW is the film's likely gross.