Limbo-land. It's a mythical kingdom at that point in time between the Christmas holidays and the presentation of the Oscars. People in "the biz" talk to each other, share ideas and go "Ooo, Aah, that'd be awesome on film". Some of those ideas get reported and movie fans go "Ooo, Aah, that'd be awesome on film". But, since the Oscars take precedence, most ideas go by the boards and are forgotten by the time of the presentation. All but the possibility of a fifth Indiana Jones film.
It's been rumored since filming began on "The Kingdom of the Crystal Skull" in 2008. George Lucas claims to have an idea he likes. Steven Spielberg claims to be on board and likes George's idea. Harrison Ford (71) claims he's very interested in wearing the hat one more time, insisting he's still in shape to do so. Karen Allen claims to be interested in coming back and Shia Le Beouf claims to be honored to be considered for continuing his role as Indy's son. So far, it's been nothing but miscellaneous claims.
However, in October of 2012, Disney acquired LucasFilm including rights to Indiana Jones intellectual property. Distribution rights still belong to Paramount Pictures. Disney CEO Bob Iger immediately expressed a lot of interest in monetizing the franchise. In English, that means a fifth film although no official announcement was or has been made. Studio chairman Alan Horn has said that a fifth film wouldn't be ready for at least 2-3 years.
Harrison Ford will be spending time at Disney Studios reprising his role as Han Solo in the upcoming 7th installment of "Star Wars". He's not young and roguish any more but he doesn't look like the Crypt Keeper either. He did most of his own stuntwork in "Crystal Skull" and keeps himself in great shape. It's not far-fetched to think he could do it one more time plus he's really good at it. The franchise has earned nearly $2 billion with "Crystal Skull" taking in nearly $800 million.
Most fans are expecting Ford to be the central character one more time and hand the reins to Le Beouf. If there is a 6th film, Ford would return as a cameo much like Sean Connery in "The Last Crusade". After that, Indiana Jones would lie in Limbo-land again depending on how Le Beouf handles the lead role. Some fans like him a lot, some are quite indifferent. He's certainly enthusiastic if nothing else.
One thing is a stone cold fact. Disney didn't buy those rights to distribute old product. They have enough of that of their own. They know Indy is worth a fortune and they want their cut. No official announcement has been made but look for Indiana Jones 5 in theaters in 2016 or 2017. These characters do not just go away and God knows these studios are masters of the sequels.