Here are the tanking specs I’ve picked out for 3.2. For the most part, blood and frost are pretty similar to 3.1. Unholy has had notable changes made to it that affect both dps and tanking. The first and most obvious change is that Unholy Blight has been redesigned as a single-target effect that increases Deathcoil damage. As a tool for AoE tanking, UB has lost its allure.

Each tree provides their own perks for DK Tanks. The Blood tree provides enhanced health regeneration. The Frost tree provides enhanced mitigation as well as several wicked cooldowns, as well as enhanced AoE tanking through Howling Blast. Unholy has classically been best for AoE tanking, but recent nerfs\changes have dimmed this a little. Talents like Bone Armor help to provide additional avoidance. I’d say that each one is perfectly viable. Unholy seems most challenged by recent nerfs to our class.

Blood Tank
53/8/10

Perks:
Enhanced Health Regeneration
Improved RP Generation
Hysteria
Improved Vampiric Blood
Will of the Necropolis

Frost Tank
10/51/10

Perks:
Improved Mitigation
Unholy Armor and Lichborne
Howling Blast provides better AoE control

Unholy Tank
5/8/58

Perks:
Improved Damage Avoidance
Anti-magic Shield\Zone
Bone Shield

I’m excited to get into the new dungeon and see what these can do. I may just stick to the 3.2 variant of my Frost spec; it seems to work nice for aggro. I’m most interested in trying the Blood spec. It seems like Blood has been working out well for a lot of the world 1st guilds. I’m least interested in dabbling in Unholy tanking. I’m concerned that the changes have made it less attractive. While trying to dumb down Unholy AoE dps, I’m concerned that Blizzard may have sacrificed some of its AoE tanking control In the process.