Deadline is told that George Lucas is not involved. Typically in the past, prior to the Disney purchase of Lucasfilm, these Indiana Jones titles wouldn’t move forward in production unless Lucas and Spielberg saw eye to eye on the script and all elements. That’s one of the reasons why there’s always been a gap between sequels.
Man. I always wondered why the original film (1981) didn't take off and spawn a bunch of sequels (spaced much closer together than 1984, 1989, and 2008). Not complaining about the sequels (especially Temple and Crusade), just a fan of the character and followed him on TV and in comics, etc. and always wanted to see more Indy films. There were plenty of adventures that could have been translated to the big screen.