Both Wowhead and MMO-Champion posted previews of the Hunter tier 19 (and PvP) armor today. This is definitely Sylvanas-inspired armor and will probably suit Marksmanship the best with their Dark Ranger talent and the Thas’dorah bow. There are many colors for the various difficulties and PvP tiers, with the Mythic and Elite PvP sets being a little bit flashier as usual.
For the other colors, I’m not sure which goes with what difficulty yet. We won’t know for sure until the tier sets are in the database. When that happens we should also be able to preview the sets on other races with the model viewer on Wowhead.