No way it will be a 1911, even though it's a better choice than the M9. My bet will be either the HK45, or the P227.
Much as we all like the 1911, it's going to be hard for any military officer to walk up to a Congresscritter or bureaucrat and say, we want a 103 year old design
even if they say it's "reimagined" or whatever
If I were Colt, think I'd borrow a page from Sig, and build a 1911 Rail Gun with a
slightly wider and longer grip, to allow 10+1 rounds, then pitch that to the military. And I'd call it the Model of 2014.