Hello Tim Benbow,
Welcome to Microsoft Community.
According to your description, the Dock you are using for Surface Pro 6 May be Surface Dock or Surface Dock 2, both of which are connected to Surface through Surface Connect. More at Identify your Surface Dock and features - Microsoft Support
The latest Surface Pro is still powered through the Surface Connect port, therefore the dock you're using now is compatible with the upcoming Surface Pro Windows 11 AI PC:
Meet the new Surface Pro 11th Edition, a Copilot+ PC | Microsoft Surface
Best Regards,
Mitchell | Microsoft Community Support Specialist