For those who didnt notice or know, you can kill the new elites from Nagrand( draenor ) and have quite a huge chance to drop an Partially-Digested Bag that contains a:
Elixir of Ancient Knowledge - Item - World of Warcraft
I killed 3 of them at row and on each Partially-Digested Bag had 1 Elixir (the chances are 32% as far i saw on wowhead)