https://www.cnet.com/news/microsoft-snazzy-surface-hub-2-gets-a-backwards-compatible-sibling-in-2019/

The Surface Hub 2S seems like new hardware to roll out in environments that have highly customized the original Surface Hub from 2015 -- based around older software -- but want to use it with the snazzy redesigned hardware of the Hub 2.

The Hub 2X, on the other hand, will use the removable processor cartridge design of the Hub 2 to add new features, such as the ability to tile and rotate, support multiuser login and upgrade the platform to Microsoft 365. But you won't get those essentials until 2020.