I can't see "international" heroes like Namor or BP spinning out of anything but the SHIELD movie when it gets going. Of course there can be references but it may start to take shape there. Marvel Cinematic Universe's style has been to show and present different elements of the MU in different movies. Like we know cosmic is coming down the pike and that has been actuated by an appearance by Thanos. It's a clue of what's to come. Outside of what we have seen about Cap's shield we havent seen much of BP anything lately. Heck Thanos could pop up in any one of the Big three's movies(Probably THor if we're to be honest).
Hopefully we will see more in the second and third wave of properties. The genres these different corners of the MU represents will make will be a blast to expereince.