There's been lots of talk lately of 'Iron Man 3' being the last of the Iron Man movies. And that may very well be a (sad) possibility. But that doesn't mean it's the end of the Iron Man universe. While promoting 'Iron Man 3,' star Don Cheadle talked about the very real chance that we'll see a spinoff War Machine movie in the future. Cheadle even has some very definite ideas on what 'War Machine' would be all about.