I heard on another board the tentative plan they had to relocate The Flash/Himalaya to the Pistachio Park/Swiss Twist/Bayrn Kurve area didn't work, so now it's debated if it'll be moved to another park or scrapped entirely. I feel it's reliable info, because it also called the Teen Titan Turbo Spin before it was announced.
While I'd be bummed to see it go, it was about 40+ years old. I can understand if they scrap it, it's got to be close to the end of it's usable life. At the same time, they desperately need flat rides, so you'd hope they'd just get a newer model.
If not, I really really hope the next big attraction announcement would be a flat ride package. An Endeavor would be a nice upgrade to the old Enterprise, and they have them at other SF parks. Even just bring back a Tilt-a-Whirl.
And seeing how SFStL is getting a Skyscraper/Booster-type attraction, that isn't out of the question either. If they tore down the Laughing Dragon restuarnt (a tall order, I know) and cleared a tree or two, I think it could fit up there and would give an attraction to an area that could use one. And while I'm not necessarily a huge fan of those rides, it'd be a great location for one being on the top of the hill.