Not only is Microsoft said to be releasing a Surface Book 3 and Surface Go 2 this Spring, but it also has new accessories planned. While likely backwards compatible, they point towards Microsoft embracing greater connectivity options. It would appear that the Surface Book 3 will offer considerably more performance than its predecessor, too.
https://www.notebookcheck.net/Surface-Dock-2-to-launch-soon-with-USB-Type-C-alongside-a-new-and-more-powerful-Surface-Connect-charger.461144.0.html