Hi Scott
I've actually made a post about this already here.
I originally thought this was down to the move to China, but it seems that it may be intentional in order to purge stock (after all they aren't cheap!) before Surface Hub 2 is launched and Surface Hub is no longer desired from businesses.
If this is the case, it would seem Microsoft have massively underestimated how many they'd need to keep them going, given we're only just into June and we have potentially between 6-12 months before we're going to be able to get our hands on Surface Hub 2.
Ouch...
D
