Date: 3rd December 2015
While there's no script, release date or even official announcement that Steven Spielberg and Harrison Ford will make a new Indiana Jones movie together, they have been so positive about reuniting that it's already seen by many as a foregone conclusion.
While Lucasfilm / Disney is currently getting their "Star Wars" universe ready, this is the other big property under the studio's umbrella waiting to be exploited. However, Spielberg thinks that once Ford hangs up the fedora, that'll be it for the character.
"I don’t think anyone could replace Harrison as Indy. I don’t think that’s ever going to happen," he told Screen Daily. "It’s certainly not my intention to ever have another actor step into his shoes in the way there have been many actors that have played Spider-Man or Batman."
Source: Press Release