The basic idea is you are entering Hogwarts itself (no surprises there!!), coming in via the Gryffindor common room and being immersed in the full school experience. They are still not saying what the ride itself will be, but we can take a pretty educated guess that it will be the fabled Kuka robot arm applied to a roving motion vehicle (like Spiderman on steroids!!), probably with 3-D and with a range of new experiences thrown in for good measure. The Kuka arm can move in a full 360-degree range and, when fixed to a moving vehicle platform, should be able to put riders through all manner of manoeuvers (although they do stress this is NOT a coaster).
They promise it will be new, dramatic and a type of experience we have not had on any other ride before, and it will include adventures with a whole range of characters and dangers from the book/film series.