https://www.cnet.com/news/microsoft-reveals-project-xclould-service-to-stream-xbox-games-to-phones/

"Project xCloud's state-of-the-art global game-streaming technology will offer you the freedom to play on the device you want without being locked to a particular device," writes Kareem Choudhry, Microsoft's corporate vice president for cloud gaming.

When an Xbox controller isn't available, a touch overlay is.