Well, some of it’s likely to be interesting palette swaps.
For example, the Deteriorating Plate set, a black recolor of the Shattered Hand/Grimscale Plate set https://www.wowhead.com/transmog-set=351/grimscale-plate-recolor is a look I’d like to wear from time to time. Say, in Northrend, where I’d want a little more coverage, but I’m still all about the (Somewhat in this case) scanty.
This stuff drops everywhere, and to mog into that color would be a nice bonus for me.