Ever since the release of "Indiana Jones and the Kingdom of the Crystal Skull," George Lucas has been saying that he and Steven Spielberg have been working on the fifth installment. The only thing that was needed to move forward, was for them to come up with a "MacGuffin," which is the object that Indy will be going after.
Now, during an interview with BBC News, Shia LaBeouf was asked whether he will return for "Indiana Jones 5." "Steven [Spielberg] just said that he cracked a story on it before I left," he replied. "And I think they're gearing that up."
So it sounds like Spielberg and Lucas found their MacGuffin. Harrison Ford previously revealed that he would return for another film and LaBeouf would likely be back as well. It seem like "Indiana Jones 5" is ready to go.