Well we know that Fury answers to a "World Council" so I assume that Shield is still an international organization. I'm sure that we'll get a bit of travelling and globe hopping.
I think there's a line from the end of CA:TFA where Fury mentions that SHIELD was a successor organization to the SSR.
The impression I was left with was that, while what we saw was primarily American, it was actually an initiative of the Allied forces as a whole. So it'd make sense (in a comic book logic kind of way) that after WWII SHIELD would become a sort of NATO for espionage, bleeding edge tech and super-humans.