Love the unholy DK content. Sadly I'm just not sure that it brings enough for the MDI compared to another rogue, a DH or a mage. The idea of seeing possible multiple comps at the MDI though is very exciting.
Players are so blinded by the "Aug Meta Requirement" that in reality it's not needed and actually lowers dps by 8-9%. We've been running higher keys without an aug and it's been just fine, sometimes way better just from the shear dmg increase. More and more 25+ keys are running non aug groups and I'm loving it.