Slightly different wording on the official Xbox news page:
https://news.xbox.com/en-us/2019/12/12/microsoft-unveils-xbox-series-x/
Its industrial design enables us to deliver four times the processing power of Xbox One X in the most quiet and efficient way, something that is critically important in delivering truly immersive gameplay. We also designed Xbox Series X to support both vertical and horizontal orientation.
Powered by our custom-designed processor leveraging the latest Zen 2 and next generation RDNA architecture from our partners at AMD, Xbox Series X will deliver hardware accelerated ray tracing and a new level of performance never before seen in a console. Additionally, our patented Variable Rate Shading (VRS) technology will allow developers to get even more out of the Xbox Series X GPU and our next-generation SSD will virtually eliminate load times and bring players into their gaming worlds faster than ever before.
We are minimizing latency by leveraging technology such as Auto Low Latency Mode (ALLM) and giving developers new functionality like Dynamic Latency Input (DLI) to make Xbox Series X the most responsive console ever.
One Console, Four Generations of Gaming
One of the things we’re most proud of with Xbox Series X is the promise we’re delivering to our fans who have and continue to invest with Xbox. Thanks to backward compatibility, you can expect your gaming legacy, thousands of your favorite games across four generations of gaming, all your Xbox One gaming accessories, and industry-leading services like Xbox Game Pass to be available when you power on your Xbox Series X in Holiday 2020.