Steam has released a new client beta which released with two images using the filename “SteamU” pictured above and below. These images show an entirely new user interface for the Steam platform. Digging further a reddit user Rntm14 found a Steam profile matching the one found in the image named Lethalfoot with the profile url “Steam Universe” meaning SteamU most likely stands for Steam Universe.
Valve quickly released a new client beta that removes all these files, but something is definitely coming soon that’s going to change Steam in a big way. I’ll be updating this article as more information pours in.
This information was gathered from Steam Database on Twitter.