The shots come courtesy of Pavel Djundik (via PC Gamer), a name you may recognize as the creator of SteamDB. He tweeted that an image of SteamOS 3 leaked, and people are already getting it running on other portable consoles such as the GPD Win 3 and the Aya Neo.
https://www.techspot.com/news/91300-here-what-steam-big-picture-mode-look-like.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/91300-here-what-steam-big-picture-mode-look-like.html?utm_source=dlvr.it&utm_medium=blogger