Personally, I would farm the mats and craft one after the patch arrives and smart loot/craft is active. You still get very good stats with the lvl 60 hellfire and it helps you in the beginning of the addon.
I personally think it's a coin flip. Potentially a pre-loot 2.0 HR can be better, but the chances for a really bad ring are higher as well. Do you like gambling? Craft them now. Wanna be safe? Wait for RoS.
Does anyone know what droprate it will be on live when 2.0.1 hits?
I heard 100% but I am not sure if that will be changed when it goes live.
I can only do MP4 and Have runned a infernal machine once a day for a week now without a organ dropping. Add constant crap drops and the game is utterly boring. I dont really feel the enjoyment, it is almost inpossible to get an organ on MP4