Death Knights
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* Frost Presence: The damage reduction granted by this ability has been increased from 5% to 8%.
After nerfing DK tanks' health and armor and presence and avoidance and threat.......
A buff as what I believe a series of buffs to come regarding passive damage mitigation/health pool.

* Pets
o Gnaw: This death knight ghoul ability now has a 1-minute cooldown.
Whatever

* Talents
o Blood
+ Heart Strike: Secondary targets of Heart Strike now take half as much damage.
Blood dps nerf, imo justified. If you are a tank who likes to AoE 3 mobs only with physical dmg, Now you must rotate between targets...
+ Subversion: Now also increases the critical strike chance of Scourge Strike by 3/6/9%.
Bizz says "no no !" to Obliterate Unholy builds #1
+ Vampiric Blood: Cooldown reduced to 1 minute and duration reduced to 10 seconds.
A somewhat buff for blood tanks. with glyph (which was nerfed) we have 15 secs of VB.. and more on demand.
Imo, better than 30 secs every 2 mins.
o Frost
+ Threat of Thassarian now also causes Rune Strike to use both weapons when dual-wielding.
DW frost tanks had aggro issues due to the small numbers their hits/crits and RS did. This change is buffing the primary DK threat generator to make it valid.
+ Unbreakable Armor: Cooldown reduced to 1 minute and changed back to granting 25% additional armor while active instead of flat damage reduction based on armor. The amount of strength granted has been reduced to 10%.
Again a cooldown buff as frost tanks did take tons of damage after all the DK nerfs.
o Unholy
+ Bone Shield: This ability now has 3 charges instead of 4. Cooldown reduced to 1 minute.
Now.... this looks like a buff... but imo, the least buffing change to tanking cooldowns this patch.
+ Dirge: This talent no longer grants additional runic power from using Obliterate.
Bizz says "no no !" to Obliterate Unholy builds #2

Not a bit nerf but on my shittygeared blood toon, as i had crap dps before, this forces me to do some changes into it.

Thanks for the info.