Per Jim Hill (so grain of salt and all that), Disney's current plans for Indiana Jones involve the following for 2021 (the year INDY V - at this point - is scheduled to be released, as well as the 40th anniversary of RAIDERS):
1. 6-month refurbishment of Epic Stunt Spectacular, more to improve infrastructure and sets than to radically rework the show experience itself.
2. Indiana Jones meet-and-greet.
3. New, dedicated Indy-themed store/market area (though Indiana Jones Adventure Outpost already serves that function quite well, in my view).
And that's it! As someone who loves Indiana Jones, I'll take what I can get, but this kind of small-scale thing, which Disney would likely sell as some major park addition, reminds me of the similarly small-scale initial plans for Star Wars Land.
Now, retheme Backlot Express to Marcus Brody's Museum of Antiquities AND add an actual, for-real Indiana Jones ride (of some sort), and we can talk.