there were articles a-plenty about Steam OS references being found / associated with Asus Ally gaming handhelds and WHAM, Lenovo Legion Go S comes out first! I don't recall an iota of rumor that Lenovo was doing anything with Steam OS. KUDOS Lenovo, you're still my fav!
www.engadget.com
The Lenovo Legion Go S is the first third-party SteamOS handheld
At CES 2025, Lenovo showed off the Legion Go S, which will come in two different versions: a Windows 11 model and a SteamOS model, which is the first of its kind from a third-party manufacturer.