The new driver is currently available for download from AMD’s website. It is officially supported on 64-bit versions of Ubuntu 16.04 LTS. It’s very similar to the earlier beta release and AMD still calls it a beta, but apparently it is stable and there are installation instructions on the website.
Already the beta SteamOS 2.83 includes the new AMDGPU-PRO driver, so it is likely that AMD graphics will finally appear in future Steam Machines. AMDGPU-PRO also supports # Vulkan graphics.
Besides the new RX 480, the driver supports the R9 Fury X, R9 Fury, R9 Nano, R9 M395X, R9 380X, R9 380, R9 285 graphics hardware.
AMD’s “fglrx” graphics driver which was the basis for my Linux days is still around but it is fast falling by the wayside. Of course if you don’t want to try your hand on Linux gaming there is always the default open-source driver, which is ok for normal desktop use but pants when it comes to 3D.
AMD is improving its game in Linux, although it is still behind Nvidia in many ways.