The largest and final raid in Legion will be released beginning January 17 with LFR for the first wing beginning on January 24. The schedule is as follows:
- Tuesday, January 17: Nighthold Normal and Heroic difficulties open.
- Tuesday, January 24: Nighthold Mythic difficulty and Raid Finder Wing 1 (Arcing Aqueducts) open.
- Tuesday, February 7: Nighthold Raid Finder Wing 2 (Royal Athenaeum) opens.
- Tuesday, February 21: Nighthold Raid Finder Wing 3 (Nightspire) opens.
- Tuesday, March 7: Nighthold Raid Finder Wing 4 (Betrayer’s Rise) opens.
You can read a raid preview on the WoW official Website