In an interview with Variety, Chris Evans (Captain America) discusses his intentions to retire from acting once his Marvel contract runs out:

Evans recently made news when he said he plans a short break from acting after his Marvel run ends, but now, he tells Variety, he wants to retire from being in front of the camera. “If I’m acting at all, it’s going to be under Marvel contract, or I’m going to be directing,” he says. “I can’t see myself pursuing acting strictly outside of what I’m contractually obligated to do.” That still leaves him some time on the bigscreen: Over the next several years, he will clock at least three more appearances as the red-white-and-blue-clad superhero in “Avengers” and “Captain America” sequels

The article does not mention whether he would be willing to return to Marvel after his current contract expires. He was asked to sign a nine-picture deal but ended up compromising on a six-picture contract which presumably include 3 Captain America films and 3 Avengers films. The article also does not reveal whether he would be interested in directing a film for Marvel.

Chris Evans can be seen in Captain America: The Winter Soldier April 4. Tickets are available now. He also will be appearing in Avengers: Age of Ultron which has just started filming with a May 1, 2015 release date.