https://www.theverge.com/2017/9/20/16340160/microsoft-xbox-one-x-enhanced-1080p-tv

A lot of the focus of Microsoft’s new Xbox One X console is on 4K and HDR gaming, but there are thousands of Xbox fans who still haven’t upgraded to a 4K TV. While the 4K focus is obvious, Microsoft is explaining in more detail exactly how existing games will run better on an Xbox One X without a 4K TV.

Microsoft has an Xbox One X Enhanced program, which means games with the “Enhanced” tag have been optimized for the new console. This doesn’t necessarily mean that 4K and HDR have been added, as there are separate logos for those features, but Enhanced means the game will run better on the Xbox One X on a 1080p or 4K TV.