The first screenshot shows my Xbox Live friends list on the Switch. And if that isn't surreal enough, the second picture shows Duncan and I playing split-screen on the Switch, with Henrietta joining us via the Windows 10 Edition on her PC!
But this could be just the beginning: will Microsoft begin creating graphically scaled-down Switch ports of their popular games? Who knows! There is a precedent for cross-company console-handheld cooperation, such as with the Dreamcast and Neo Geo Pocket Color.
Incidentally, I'm curious to see what the next "Xbox Scarlett" looks like. With the streaming focus, it wouldn't shock me if they allowed both streaming from an Xbox to a Switch-- ala the PS4 to Vita, like the Wii U's gamepad-- and perhaps even allow the Switch itself to connect directly to their cloud streaming service.