Shopping habits possibly.
I have a feeling one of the pieces of information they will need from guests will be a phone number and based on how you walk around the park or shop or whatever they will push specials and offers through text to a cell phone to entice people to walk in a shop.
Lets say you're walking down main street, and you're almost to the hub, the rfid scanners in the park pick that up and send you a text message for a coffee and danish special at the bakery...or walking around world showcase and a new beer is being served in Germany, you'll get a text to come and sample the new beer and buy it...
Things like this is what I feel like is going to happen with all this "innovation".....and it sucks!
Some of the "fun stuff" that will happen I think for example is getting on Haunted Mansion the Ghost Host instead of saying "Welcome Foolish Mortals"....we'll get a "Welcome (your name) to the Haunted Mansion"... things like that.