Today the PTR was updated and it is now possible to see these new transmog, however there is an issue with the Sargerei Commander’s Mantle transmogs in all their colors and that is that these remove the green glow that Felscorned Shallamayne has in the middle of the hilt and makes a faint yellow light appear in its place, as you can see in the following image.
https:/ /i.imgur.com/Qx68EoA.png