AMD is currently hosting private events for selected press members around the world to talk about an upcoming driver update.
The new driver will be released mid-December. There is an embargo, but at this moment we are unsure if the information and the driver will be released simultaneously.
Our sources claim that new Adrenalin will also support undervolting [among many other things], yes you heard that right, fully automatic undervolting. This was quite a topic at Vega launch
Apparently, the next major driver release is sometime during the next 4 or 5 weeks. I've tried the reported undervolting with RX480 and RX Vega -- higher clocks, lower temperature. The new driver feature is supposed to make it easier to do.