Will the new USB-C adapter be (partly) compatible with the Surface Pro 4 too?

[JopV]

Will it be compatible? Even only charging?

 

[Zachary Boddy]

I don't see why not. There might be "some" features missing because of the differences between Kaby Lake and Skylake but in all honesty as long as Microsoft throws the support out (which they almost certainly will) it should have full functionality on older devices.