To the surprise of none....

...the updated 3.2 patch notes:

Seal of Vengeance and Seal of Corruption: These seals have been redesigned to deal substantially more damage. Now, once a paladin has 5 copies of the debuff from these seals on his or her target, on each swing the paladin will deal 33% weapon damage as Holy, with critical strikes dealing double damage. In addition, the damage-over-time effect is now considered a melee attack instead of a spell attack and the effects from these seals can only be triggered by auto-attacks and Hammer of the Righteous.

Ain't this just a damp squib for Rets?