Incorrect. NiM is supposed to be all new mechanics, not just an additional 1 mechanic and and more hps/dmg, etc. All along in our conversations with the Dev's NiM would be on the PTS for balance testing.
Yeah, I know it's all new mechanics. But NiM being on the PTS would spoil world/server firsts. :/ It's why, outside of initial tiers, you don't see heroic bosses on WoW's PTR. Hoping for the same thing here.