There is indeed a Horde Ogre megathread located here:
As far as Vrykul, I’m personally unsure if there ever was a Vrykul megathread. You might want to search to see if someone ever made one, as I’ve never personally seen a Vrykul megathread.
Getting back to Sethrak, it’s good to see this megathread still active. I’m still interested in making a Sethrak if they ever became playable. I’m also still leaning towards making a male Sethrak Shadow Priest if they did become playable, as I feel like the Priest class is a likely option for them.