Google and Warner Bros. have released an experimental Hobbit game/”experience” meant to be played on Chrome. Below is a YouTube ad for it. The game takes you through six Hobbit-related sites in 3D. Each site has a game.
Only three of sites, Trollshaw, Rivendell and Dol Guldur, are currently available for playing. Thranduil’s Hall, Erebor and Lake Town will be coming later (I presume delayed so as not to give spoilers for the movie).
Open up Google Chrome and go here to view.