It appears that this questline is set extremely close to Shadowlands, after seeing the direction that Blizzard is going, with Sylvanas and the Jailor.It's also possible that they may never comment on it again.
If I'm a Highmountain Tauren, can I switch races to Tauren and still do this quest with that character? I know for the "Allied races" you have to start one of them fresh, but Tauren aren't an "Allied Race", thanks!