Aww, i wanted grimrail depot.
Shame about depot (even though I did dread facing that fight in a clueless pug). Still, expected. They seem to have a habit to drop a dungeon or two per expac from the timewalking. Like the infamous Halls of Reflection. That place was mechanically simplistic if you knew what you were doing, but still soo tightly tuned when current, many people back in the day took the opportunity to skip it using the lockout trick. Back then, if you had an active lockout for a heroic dungeon, it showed with your raid lockouts, and like those, could be extended. And having active lockout, meant your random LFD queue could NOT put you in that place. Of course Blizz realized, and before long, lockouts stopped affecting LFD. People didn't whine too much, because that meant extra chances at loot: party with a friend who didn't run it, have them queue for specific, and you could keep rerunning to your heart's content as long as you didn't run out of friends to queue with you (imho it's still the case today, btw).