So tonight would be the 3rd night in a row where the Highmaul raid was not available to Aggrammar/Hellscream EU. I'm not aware if any other servers have the issue but when I check the ingame premade builder I don't see any active Highmaul raiding groups (there were a crapload on wednesday night).
It started with a restart in the early hours on Thursday morning which caused the server to behave as if the date were 13th November, that means no world bosses are spawning, the bonus loot coin giver does not exist on Ashran and anyone trying to zone into Highmaul will be greeted with a message telling them they need to be level 100 and in a raid group.
Blizzard finally responded on the Thursday night (10pm ish) with some fix that allowed players into the raid for a short while, followed by a statement that they would do a late night restart to fix the issue properly. Amazingly the late night restart actually brought the issue back and again people were now locked out of Highmaul... And here we are on the 3rd night with no raids available.