*Disclaimer* This is no longer happening due to the announcement of two secret Marvel projects in 2014
There are heaps of new projects Marvel are planning to venture on post-Avengers, including War-Machine, Black Widow and Hawkeye spin-offs, Ant-Man, Doctor Strange, another Punisher reboot, Black Panther and the Inhumans - as well as the possibility of an Incredible Hulk sequel and a Captain America sequel in development. One thing I've never understood and most Marvel fans question this is: why are Marvel films strictly summer fare? I reckon if X-Men 2 was released in late 2002 as planned (although the script would've suffered big time) we'd be seeing a lot more Marvel films released later in the year. Therefore, there should be three maximum each summer and one later in the year (summer gets more as there are more weekends whereas fall isn't quite as competitive) This is how I believe the timeline should play out between 2012 and 2016 which is when the next Avengers movie should come out.
2012
THE AVENGERS
May 4
2013
IRON MAN 3
May 3
THOR 2
July 26
THE INCREDIBLE HULK 2
November 15
2014
ANT-MAN
May 2
CAPTAIN AMERICA 2
June 6
HAWKEYE
July 18
BLACK WIDOW
November 14
2015
THOR 3
May 1
WAR MACHINE
June 5
DR STRANGE
July 17
BLACK PANTHER
November 13
2016
THE AVENGERS 2
May 6
INHUMANS
July 15
PUNISHER
November 11
I really hope that Marvel gets it right having so many productions in development and they should choose their teams wisely. The fact that there are so many they are willing to embark could be the death of these movies, but if they find the right people to take helm of each of these films, the results will be extraordinary.