Cita:
Official Blizzard Quote
As many of you know we will be featuring a new Battleground, a dedicated world PvP zone and all new PvP items in Wrath of the Lich King. In order to make the transition from The Burning Crusade to Wrath of the Lich King flow as smoothly as possible, all accrued honor points will be reset at the launch of the expansion. We do this to ensure select players do not have an unfair advantage at level 80 from stockpiling honor to instantly purchase the newest Wrath of the Lich King PvP rewards.
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All Honor Tokens will be wiped as well. This reset should happen right before the launch of Wrath of the Lich King.