I don't know about any other realms, but on mine it seems that the heroic dungeon quest seems to be stuck on some sort of loop.
Over the last 8 days it's litterally been 2 days of UK, followed by 2 days of Nexus, then back to 2 days of UK and then 2 days of Nexus again. Ok, it's nice that it's a nice fast run for 2 triumph emblems, but I'd like a bit of a change before I really do start doing these 2 instances with my eyes shut....