You're right Peter, I think we got confused with the original Luigi's back then. Disney just waited too long to bring back the Flying Saucers and unfortunately, the creators of the original who had fixed the issues with the first one had either retired or passed away at that point. End result is that WDI came out with a low capacity dud that I can believe cost 100 millions.
Mater's Junkyard Jamboree ride system has been shopped to at least one park outside the US that I know. The park passed on it due to the huge (for a flat ride) cost. So, it appears to be a Zamperla creation that Disney purchased the rights to. Now, are those rights limited to markets that Disney is present in or Zamperla messed up by offering the ride to outside customers?
The investment announced by OLC for the Big Hero 6 attraction is 6 billion yens or 53 million USD. This is the Big Hero 6 themed version of Mater with Baymax as the "tractor". This also include a shop that will sell multiple popcorn flavors.