If you go to the frontpage and scroll down to Spell Changes and there you can find Item Set Bonuses. This is what it says:
Disarm Duration Reduction no longer reduces the duration of disarms. Now decreases damage taken while in Battle Stance by 10%.
While I like this change, will this mean we either want the Disarm reduction enchant OR the 2200 one? Blizzard stated that they wanted the enchant to be just as good as the other enchants, rendering it purely cosmetic. But with this change, the 2200 enchant will be much better.