Infernal Machine 2.0

The Patch Notes said it was enabled with the new recipes added and the Key and Organ drop rates set to 100%,

d3 items

 and Blizzard’s asking for specific feedback on it… yes, it’s Infernal Machine 2.0, now with four keys, a new Realm and Uber, and upgraded quality Hellfire Rings. I teamed up with a friend to power through some key runs and Uber battles,

wow items

and here's a report on what's new.
Hellfire Ring Requirements