To be honest, since some contracts are just paused, once business is back up and running fully again I'll probably be looking to shift more towards a 12-core by the time the 4000 series is out, so I'll probably just end up swapping both together, I don't much mind a board swap and it makes selling easier.
Even so, if that a definite or are they just covering their backs for the boards with 8MB UEFI's? The graph AMD provided also claims 300 series boards don't support 3000 series motherboards, but of course that's usually dependant on the UEFI size.