Yes, apparently it will work on any Android devices too … the xCloud game streaming will work on Chromium web browsers. All you need is a compatible controller to play Xbox games.
Taken from Engadget … You don’t have to wonder what Xbox cloud gaming looks like on the web. The Verge has learned that Microsoft has started testing xCloud game streaming in browsers, and the experience will seem familiar if you’ve tried it on Android devices. A straightforward launcher both helps you fire up recent games and find new ones to play through your (necessary) Xbox Game Pass Ultimate subscription.
Testers need a controller to play Xbox games, and the test is currently limited to Chromium-based browsers like Chrome or Microsoft Edge. It may be a while before you know what the experience is like on an iOS device, then. It’s also unclear what resolution Microsoft is using for gameplay, although it’s unlikely to be 4K when the company is upgrading its cloud infrastructure to Xbox Series X hardware later in 2021.