Overall this sounds like a compilation of rumours and figures from elsewhere. Yes, something is in the works park-wide and in specific areas. It's what exactly that's still up in the air, and has been for 4-5 years. Management know DHS needs a lot of help, as a park as a whole and with appeal for specific attractions. Carsland, Carsland and RSR, RSR only, Star Wars theming, various MI Coasters, yes even the Indy EMV have been banded about. But so far as I know it is still a work in progress. 500 mil could get an awful lot. It just depends who does it.
The park however does have more space available than it seems.
Quoting, because I don't want to lose this actual piece of insight in this silliness...but here is an example of making the joke go to 11-
"Since I'm doing the construction and am billing Disney at a rate of $220 million per hour all DHS is getting is an LCD screen that will feature Fanstasmic Mickey saying, "Welcome to Disney's Hollywood Studios" when you bring your magic band within 4.8 inches of the sensor".
Now, only 1 in 12 people would think that comment is serious. Also, I hadn't heard mention of an Indy EMV being plunked down in the studios in years. If they designed a new one that would be quite enjoyable. All those ideas would be enjoyable. Let us hope they do something at DAK and DHS and then hope that the something in both places is well done.