h++p://www.nbcnews.com/pop-culture/movies/indiana-jones-back-steven-spielberg-harrison-ford-reunite-fifth-installment-n538976

Looks like that are doing a 5th installment, which may explain why they appear to be keeping Indy at MGM. Personally I think they should have stopped at 3.

[spoiler]The aliens ruined it! [\spoiler]