Comic-Con 2013 Reveals:
1. Batman and Superman in the same movie, maybe against each other?
2. Captain America 2 is supposed to be darker. Interesting, maybe?
3. Avengers 2: Age of Ultron (I would just like to state now, I have been calling this villain since the beginning.) Also with Mr. Pym.
To me these are the main important ones. Other will differ, but that is how it goes.