Just as a point of information, I worked as a merc. for Heroes/Heroine combat, so if you're interested - over the course of the 2 days:
10+ groups beat Hero's Combat.
only 5 beat the Heroine's Combat.
and only 1 group beat the Mercenary Camp.
Setup was galkaRDM/mithraBLM/taruWHM/humeWAR/humeTHF/elvaanMNK. Lvl60 no subjobs, but pretty pimp equip (except AF and a few other exceptions). While working at heroes/heroine combat for 8 hours or so, it was pretty hilarious watching some of the battles.
Edit:
http://ffxi.somepage.com/itemdb/7007 is the body armor with acc/eva bonuses activated by pamamas.
Edit2: any more questions about dev panels or festival in general, and I'll try to answer before I leave in about 30 minutes.