Description suggests it's as much a dark ride as a rollercoaster and if it was something especially intense, you'd expect them to show it off more if it was an intense coaster so I'd be surprised if it was any more intense than something like Expedition Everest or Thirteen. 100ft is very tall for a ride without a drop to show off too, about the height of the Jurassic Park River Adventure building, you've got to imagine there's a reason to go to that expense.
Disney did recently file a patent for a long armed suspended swinging coaster which probably would require a large building but again you'd think they'd want to show off a novel ride system as much as possible rather than keep most of it indoors.
I'd imagine the Gringotts bank coaster was seen as a bit of a blow to Disney Imagineer's pride so maybe it'll be a "it does everything" technical showcase but that leaves the 'world first' element to ponder.
Guessing they'll need to reveal the ride system before heavy work starts (they've already put up construction walls) otherwise people will guess it from evidence/leaks so we'll probably get more info in the next month or two.
Fingers crossed they can fix the two main problems I have with the Ratatouille ride in Paris; being able to see the floor and length of the ride.
Epcot's my favorite park so I'm liking that it's getting some rides which will spread the queues out more, rather than them being concentrated heavily on Soarin, Test Track and Frozen. Guessing Disney are hoping the Epcot and Studios expansions with ease off the massive overcrowding at Magic Kingdom.
No doubt at some point they're going to get rid of the Journey into the Imagination ride which makes me a bit sad (the number of 'classic' Epcot rides keeps shrinking) but it's hard to see them resisting the temptation of a Frozen style makeover.