ZOTAC has now showcased the ZONE, its alternative to the ASUS ROG Ally and Steam Deck. Not only has the company now confirmed all ZOTAC ZONE specifications, but it has shared a release month and launch pricing too.
The version of SteamOS used on the SteamDeck is not publically available.
They could go with a linux distribution though, but the setup process for many consumers would proobably be too complicated if they don’t make their own launcher/interface.