This is where I chime in to point out that the "leaked plans" date to a period before final agreement and approval of the project. It was reported that Cameron and Disney had trouble agreeing on a final plan for the project -- so it's entirely possible that aspects of the plan were changed between the leaked plans and the final greenlit project. Given the circumstance, it's not that improbably that Cameron's folk demanded some changes to make things more impressive before signing off on them.
In general, I would rarely expect Disney on their own to "upgrade" a ride to something more expensive during the planning stage, but the presence of Cameron is a different dynamic from a typical WDI situation.
So much trouble in fact that during the initial leaked plan ogling phase there were rumors from the insider bigwigs that the land went from 3 rides (current rides plus bike coaster) to one ride with the whole land on the chopping block and Joe Rohde possibly looking for a job, to the two rides that were in the plan all along.