With Phase Three and on. We start with Ant-Man, and I'm assuming sequels to the big 3 films (IM, Cap, Thor), one more new film (they aren't doing a Guardians sequel, unless it's part of IM4), and then Avengers 3. This is assuming the actors will all be back too.

The new film most likely will be Dr. Strange, but there is potential that Black Panther could squeeze in.

I also think there will be more time in between big Avengers movies, so more movies per phase might happen too. This gives opportunities to introduce more and more new characters and spin-offs and such.