Based on their description of the prizes for 1st, 2nd, and 3rd place, it sounds like the winners get Metalbeard's Sea Cow, Benny's Spaceship, Spaceship, SPACESHIP!, and Emmet's Constructo-Mech, respectively, in addition to the golden Emmet statuette and the LEGO MOVIE promo tin (has the 9-minifigs sitting in a movie theater). Though the official rules refer to them a large, medium, and small "set not yet officially revealed". Also, if you read the official rules document
is says the USD value of each (on page 3): $250, $100, $60. They are each signed by the designer too, so that's cool.