Since this is just going to be a Cinematic Spectacular show, I don't think we'll see much beyond Transformers. It'll be a 3 minute piece, fireworks, lasers, fountains, then "Transformers: The Ride. Summer 2012". Concept art will be released online shortly after with a press releases.
Now, wouldn't it be interesting of they erect a screen over the Potter area, and as an encore they do a HP show, then project the Diagon Alley area onto it? Not saying it'll happen, but it's a cool idea I had.