Posted by Lylirra on US forums:
Just as an FYI, the scaling drop rates for Death's Breath are the same as Demonic Essence (i.e. they scale the same way as you progress in difficulty). Currently, those drop rates are:

Normal - 15%
Hard - 18%
Expert - 21%
Master - 25%
Torment 1 - 31%
Torment 2 - 37%
Torment 3 - 44%
Torment 4 - 53%
Torment 5 - 64%
Torment 6 - 77%

We have no plans right now to change the rates, given that we're only one day into the expansion (we'd like to give things a bit more time to settle before we start pulling levers and adjusting knobs). That said, we are paying attention to your feedback! We'll be keeping a close eye on your posts, tweets, and in-game chat, as well as our own internal data, and if it looks like things aren't in a great place, we'll definitely reevaluate and make changes if needed.