Interesting, some Vega20 Linux patches have been listed, and have been posted by somebody froMA MD, likely a driver developer. We mentioned Vega20 a few times in the past already, and that would be a die shrunk Vega, much like what Ryzen 2000 will be towards the original Ryzen procs.

Whatever the production node is, we don't know yet though as that can be anything from 7 to 12 nm.  The Linux driver entry is listing no less than six new device IDs referring towards "Vega 20".Earlier on Vega 20 was mentioned to be released the second half of 2018. It is mentioned to get the same 64 CUs / 4096 shader processors as in Vega 10.

Vega 20 will be a die-shrink of Vega 10, the initial indicator was it would be a 7 nm GF9 process being developed by GlobalFoundries. However, 7nm (UV) production, as I know right now, will see the light of day in 2019. This simply might be some really early support/testing at the AMD dev team. But it is a valid entry none the less.

Source: Freedesktop via Reddit via Videocardz