I don't mind them re purposing the challenge mode stuff. They were pretty nice interpretations of a vanilla style class set compared to the "stuff from what you're raiding now" style tier sets were using at the time.
Paladin colors are just so loud though, I know it's supposed to match the ashbringer but Tirion was in white and blue, not gold red and LED bulbs spitting honey. The whole concept that your weapon has to match your armor in transmog makes my head spin. These are like powerful relics we're finding in random corners of the globe. It's shouldn't have to match your blouse.
edit: New stuff is nice though, and they're trying to add in some 3D bits, it's most obvious on DK stuff.
Warrior:
http://media.mmo-champion.com/images/news/2016/april/warriorTier19.jpg (Chest, boots, gloves)
Death Knight:
http://media.mmo-champion.com/images/news/2016/april/tier19DeathKnight.jpg (Boots Gloves)
Demon Hunter:
http://media.mmo-champion.com/images/news/2016/april/tier19DemonHunter.jpg (It's everywhere, but this might be an older version, there's like 3 other sets floating around.)