In this product for the first time, we are introducing adventure "Bricks." Larger than Bits or Shards, Bricks are the building blocks of an adventure. GMs can simply slip these into place to build up the structure they are making. Given enough of them, Bricks could be constructed into an adventure all themselves, with the GM supplying nothing but the mortar to hold them together.
Dungeons II has two types of Bricks. The first is "Encounter Bricks," fully-detailed Dungeon encounters for a GM to place into his or her dungeon. The second type is "Room Kits," detailed descriptions of complete rooms that a GM can just drop into a dungeon. Examples are things like "The Tomb," "A Cell Block," "A Volcanic Workshop," etc. They could also be rooms with tricks or traps.
Add to that some stairs, doors, and another good selection of Dungeon Bits, and this proves to be a very exciting product for game masters.