So I guess the full rumors are out and flying. lol Here's what little bit I've heard from a few sources, and take all of it with a grain of salt because none of it is "official" in any way at all, just what I've gleaned and can easily be inaccurate.
What I've head is that are removing the Lost River and Rib House and using that area for an expansion that will likely include another rapids ride and BBQ place, but there's also a good chance it will include other things as well.
I haven't heard anything about Lake Silver at all, but with them needing some sort of retaining pond for the rapids, and with Fireman's Landing being designed the way it is water side I would be surprised if they don't have some sort of "lake" there in the future, just maybe not as big as it is now.
I haven't heard anything about theaters and stores on "landside" changing or having anything happen to them, and honestly doubt there are any plans for that. I think all of the changes and expansions will end up being waterside of the riverfront area. I don't see any reason for them to change any of the theaters or stores that are there now, except the rib house and maybe Rube Dugans, the other store that's water side next to the Lost River. That will disappoint my daughter as she likes shopping for dresses there.