The FCC has confirmed that the Surface Book 3 will feature Wi-Fi 6 connectivity. Spotted by Windows Latest, the listing includes references to the device having an Intel Wi-Fi 6 AX201 modem, which supports up to 2.4 Gbps transfer speeds and Bluetooth 5.1 connectivity. The Surface Book 3 may cost as much as US$1,699 at launch, according to past leaks.
https://www.notebookcheck.net/FCC-confirms-Wi-Fi-6-connectivity-Microsoft-s-US-1-699-Surface-Book-3.463145.0.html