Whew! I feel bad for the DK tanks out there that hopped on the "stack-all-your-health" train when this update first came out. Hopefully you didn't gold out all your gear and put legendary health enchantments on it.
Obsidian damage shields were reduced to 10% (from 15%) and using Spell Symmetry just became less effective.
That being said: It seems that DK tanks are sticking to the same meta and gear that they've been sticking to for the last few updates now:
Ulti Regen builds. BS, Tava, and Ebon.