Marvel just announced the upcoming 4 films and they are Iron Man 2, Thor, Captain America and The Avengers! Spideman 4 maybe in the works too. In addition to the films that will be released this year like The Incredible Hulk and Punisher: War Zone and not forgetting X-Men Origins: Wolverine will be release next year.

2008

• The Incredible Hulk
• Punisher: War Zone

2009

• X-Men Origins: Wolverine

2010

• Iron Man 2 - 30th April 2010
• Thor - 4th June 2010

2011

• The First Avenger: Captain America - 6th May 2011
• The Avengers - July 2011

More juicy details:

Marvel Studio’s David Maisel did also say that Thor will actually be introduced in Iron Man 2, which is one of the crossovers in the works. In addition, in 2011, the Captain America movie will lead directly into The Avengers. Whoever is cast as Steve Rogers aka Captain America will essentially be making two movies at once - since the character will be introduced in the first movie and head straight into The Avengers.

Regarding more Hulk movies, Maisel’s response was “we definitely plan on continuing.” But we all know that depends on how well Edward Norton’s reimagining does this June. In addition, Maisel gave this last update, “I can’t give any other updates other than to say it’s in development and everybody’s excited about Spider-Man 4.” This is definitely a very promising future for Marvel and I’m certain the comics community is abuzz today with much discussion on all of the upcoming films.

Source: Marvel Announces Next Four Films - Iron Man, Thor, Captain America, Avengers!