The latest announced changes for Death Knights are out, and this time, they seem to be mostly concerned with tanking. There's two major philosophies that Blizzard seems to following for Death Knights: First, any tree should be able to excel at tanking at least to the 5-man level, and Death Knight tanking should be at least somewhat interactive.
In that vein, they're introducing two revamped late tree tanking talents to the mix. In Frost, Unbreakable Armor will be a usable ability that costs 1 frost rune, but will only increase armor by 25% and Strength by 5%. In Blood, Vampiric Blood (previously mentioned in last week's Lichborne) will be a 1 blood rune ability that increases healing received from all sources by 50%. Both abilities will not trigger the GCD, will last 20 seconds, and will have a 2 minute cooldown. Blizzard aims to balance these 2 abilities with Bone Armor (which will have an internal cooldown of 3.5 seconds, like Shaman shields) to create 3 viable late tree tanking abilities.