I've been to two SC events in the past (Blade Runner and Lawrence of Arabia) and I can assure everyone that the steep price will be worth every penny. It will be like being inside ESB.
My best guess is they'll turn the biggest ice-rink in London into the Hoth rebel base, complete with fullscale spaceships, med bays, ops centers and a full compliment of rebel personnel plus lookalike actors for all the main cast. Every conceivable prop detail and set decoration will gone into to match ESB.
You'll probably get an hour to wonder round, buy some blue milk, play 3D chess and listen to Max Reebo's band. Then the whole place will suddenly be stormed by the Empire/Darth Vader and you plus the rest of the ticket-holders will be evacuated onto a transport, and then be shown ESB as an "In flight" movie.
That's ^ the kind of experience these guys put on (But only my guess based on previous experience).