dwatterworth, even though the article I posted about Front Panel Support For USB 3.1 Type-C in cases by legitreviews was just published in May, it may already be outdated, so you are likely correct:
Computex's best trend: USB 3.1 Type-C motherboard ports
http://www.pcgamer.com/computexs-best-trend-usb-31-type-c-motherboard-ports/
I think expunged is correct in one sense too - doesn't matter that much about DisplayPort 1.2 vs 1.3 since we will use the DisplayPort from the GPU, however, it will matter to some that cases do not provide Front Panel Support For USB 3.1 Type-C for things other than GPU.
So, I would like to hear more about the quote above on why Intel's Skylake does not support USB 3.1 or, is that an error? I notice that there is no mention of USB 3.1 at Wiki on Skylake:
https://en.wikipedia.org/wiki/Skylake_%28microarchitecture%29
So, again, maybe it doesn't matter but, I'd like to know for sure.