The tours take place at Saratoga Springs, and DVC will provide transportation if you need it. The presentation with the Q&A with the guides shouldn't take more than 90 minutes, and they will not pressure you if you need to leave for any reason.
In the past, I knew that they had lunch vouchers good for any quick service restaurant as a small token for taking up valuable vacation time, and others have mentioned getting FastPasses. I don't know what they are currently offering people who take the tour.
You'll typically get to see a model of the various types of accommodations at a mock up of their newest DVC resorts. The Doorway to Dreams store in suburban Chicago (the first offsite DVC store of its kind) had AKL villas until recently. I'm going to check out their mock up of the Bay Lake Tower at the Contemporary when I go meet other DISers there on Sunday.
I could have sworn they had the various resorts' decor available at Saratoga, but my guess is that the mockups they'll be more inclined to show in greater detail would be the Bay Lake Tower rooms.