Okay. I am monitoring this thread. Just can't really say much.
So, instead, I will give you the possibilities.
First the 20k Subs lagoon.
WDI has been working on this project for the longest time, and it looks like we're finally going to see something. The question is, what will win out? There are 5 possible solutions that WDI is considering:
1. Drain the lagoon & build a nice little walkway to Toontown to relieve congestion in the area. No new attractions, possibly a few shops.
2. Theme the lagoon into the Little Mermaid.
3. Drain the Lagoon for MK's next land, which has been determined to be a Villain Land. Here you would find a main pathway that would connect to Toon Town, but would also have many rides, & stores. One of these is Bald Mountain. Sadly, this idea seems to come to a dead end.
4. Drain the lagoon & build a Hyperion style theater
5. The Harry Potter Attraction.
That's what I know WDI is considering for the site, and anything else you've heard is most likely wrong.
As for Fire Mountain, I believe that project is dead. Not to say it will never happen, but not in the next 10 years.