Bryan on Scouting has posted pics, a review and a video of packing and for the 2013 National Scout Jamboree.
Capacity will be 115 Liters (7018 cubic inches) with dimensions 32″ x 18″ x 16″. Paded backpack straps can be deployed out of a compartment when hauling the bag.
Here’s a video discussing how to pack your Jamboree Duffle with items recommmended. (Note that your personal daypack as well as the duffle is supplied by your Jamboree troop or crew as part of your Jamboree fee).
Original Duffle video