Well, we can always combine Mystic Seas with Discovery Bay, giving us one mystical land that can have hints of Jules Verne here and there, as evident by the obvious inclusion of 20k. Or, we can keep Discovery Bay as it's own thing, a transition between Main Street and Westernland even (think about it, San Francisco buildings and Main Street buildings go well together). Or it could be the transition between Adventureland and Westernland, or even the transition between Mystic Seas and Adventureland.
As for the Haunted Mansion, I kinda want to keep it in Hollywoodland to maintain the tradition of having the mansion in a different land in each park; DL: New Orleans Square, MK: Liberty Square, TDL: Fantasyland, DLP: Frontierland, HKDL: Mystic Point, DLA: Hollywooodland. I'm down to include a Princess and the Frog dark ride in our New Orleans sub-area of Westernland, though.
I read the Kali River Rapids/Jungle Cruise-cross, too. As interesting and as awesome as it would be, I think we should go a more traditional route, personally. As it is, Adventureland would already have two major thrill rides and adding a third might seem a bit redundant. I'm picturing Jungle River Cruise to be roughly formatted as such (pretend you're reading a map):
1. Boathouse
2. The Everglades **
3. Alligator Parts **
4. Safari Camp
5. Crashed Biplane **
6. Big Game Territory **
7. Watering Hole **
8. Lost Safari
9. Lion Attack **
10. Hippo Swamp
11. Cannibal Country
12. Volcanic Eruption **
13. Sacred Bathing Pool of the Indian Elephants
14. Cambodian Shrine
15. Trader Sam's Outpost
I'll elaborate on the newer scenes at a latter time. Basically, I'm envisioning the traditional Jungle Cruise format; a skipper takes boatloads of passengers down the jungle rivers of the world, encountering various bits of wildlife and danger while cracking witty narration. Naturally, we have several new scenes, those in which I have placed a ** next to. Even with six brand-new scenes, the older scenes have been significantly revamped, such as a more exciting headhunter attack and an expanded Trader Sam gag. Notice how the Amazon has been completely left out. That's because Indiana Jones and the Lost Expedition takes place in South America, much like Tokyo's Temple of the Crystal Skull. Notice the inclusion of Florida's Everglades. When you think about it, the Jungle Cruise's usual crocodiles are everyday wildlife in Australia...so why not go exotic to Australians and give the ride some alligator loving?