Bliz - 4.0.6 - Death knights
Death's Advance (new talent): While both Unholy Runes are depleted, movement-impairing effects cannot reduce the death knight below 75/100% of normal movement speed.

Unholy overall DPS charts (Aka TOP of the chart, or close to it): http://stateofdps.com/


Someone please explain what the $%@# Bliz is thinking!