Right now it's too early to tell if this is really how PvP loot will be distributed, although a faction-locked raid boss really does provide a good incentive to participate in Lake Wintergrasp. It might simply be a way to quickly distribute Arena PvP gear in Beta for more testing. For one thing, it's highly likely that Archavon will be dropping tokens rather than the pieces themselves. Furthermore, this leaves the Arena system without any rewards left to give -- though Deadly Gladiator weapons have yet to show up. It's pretty safe to assume that the way these items are distributed will change greatly between now and November 13.