The sixth edition of the Carcassonne Big Box contains:
the Carcassonne base game
the Inns & Cathedrals and Traders & Builders expansions
the mini-expansions The River and The Abbot now included with the base game
the six mini-expansions from 2012: The Flying Machines, The Messengers, The Ferries, The Gold Mines, Mage & Witch, and The Robbers. These six each include one of the six tiles for the Carcassonne: The Corn Circles II/Crop Circles II mini expansion.