"Four generations of gaming: Our commitment to compatibility means existing Xbox One games, including backward-compatible Xbox 360 and original Xbox games, look and play better than ever before. Your favorite games, including titles in Xbox Game Pass, benefit from steadier framerates, faster load times and improved resolution and visual fidelity – all with no developer work required. Your Xbox One gaming accessories also come forward with you."
@Scottie even better all first-party titles and Cyberpunk 2077 will be forwards compatible at no extra cost. Basically buy it on XBO and when you upgrade to the Series X the game will just patch itself to that version. The tools are available to all devs who want so now it's up to us to pressure the publishers to allow this instead of milking us with remasters.