Naturally, Microsoft requested confidentiality to avoid public disclosure prior to the announcement, so there is no specific mention of the Surface Book 3 or images of it in the filing; It is merely identified as Model number 1899.

Microsoft Surface Laptop 3 (13.5 inches) reviewMicrosoft Surface Go 2: Rumors, release date, price and what we wantIs Microsoft customer service good? 2020 rating

We saw a similar FCC filing for the Surface Go 2 a couple of weeks ago identified as model number 1927, so we know this isn’t that device. The Surface Pro 8 isn’t due out for several months and references to the tests being conducted in laptop and tablet mode help narrow this down to the Surface Book 3. The one new piece of information found in the filings is the inclusion of the Intel Wi-Fi 6 AX201 adapter. Given the price point and the rest of the specs that have been leaked for the Surface Book 3, the presence of Wi-Fi 6 doesn’t come as a surprise, but it’s good to have confirmation of this future-proof feature. You can read our full roundup of the Surface Book 3 rumors, but we expect there will again be a 13.5 and 15-inch model available with Nvidia GPU options, 16GB or 32GB of RAM, and an Intel Comet Lake or Ice Lake CPU. Given previous rumors and the proximity of these FCC filings, we will likely see the announcement of the Surface Book 3 in May or June, either alongside or shortly following the Surface Go 2 and the Surface Buds announcements.