I think Carolina Select (NC) won it in this age group last year. Somehow CESA finished ahead of DSC last year, earning the top seed and 1st round bye, so DSC couldn't have won it last year. I'm not sure how they did as U14's though.
This age group is very competitive, but the rest of the boys side will also be very interesting, in addition to the RIII teams, with MPSC and Bridge in the 15s, Lexington and Columbia in the 17s and CASC and Columbia in the 18s. That's really only looking at the top 4 of the brackets, but there are some good 5 and 6 seeds that could really shake things up.
Once all things are finalized, there will be some very interesting matchups to take note of.