The Surface Duo had outdated internals when it arrived earlier this year, but Microsoft will take that even further with a European launch of the device. Reputedly scheduled for Q2 2021, it seems that Microsoft is content with releasing a device with the Snapdragon 855, despite the likelihood of Snapdragon 875 devices already being on the market by then.
https://www.notebookcheck.net/Microsoft-has-apparently-scheduled-a-European-release-of-the-Surface-Duo-for-Q2-2021.505941.0.html