The Shadowlands Sanctum of Domination raid opens July 6th on Normal and Heroic difficulties.

Here's the remaining schedule:

July 13 – Raid Finder Wing 1 and Mythic Difficulties
July 27 – Raid Finder Wing 2
August 10 – Raid Finder Wing 3
August 24 – Raid Finder Wing 4

Note that the minimum item level for Raid Finder is 195.

Currently the gear drops are shown to be RF 213-220, Normal 226-233, Heroic 239-246, and Mythic 252-259. Like Castle Nathria, only the last two bosses drop the higher-level gear.

See the Wowhead overview which shows the location, and a raid guide.

Here are some videos:

• The Jailer's Vanguard
  The Tarragrue
  Eye of the Jailer
  The Nine
• The Dark Bastille
  Soulrender Dormazain
  Remnant of Ner'zhul
  Painsmith Raznal
• Shackles of Fate
  Guardian of the First Ones
  Fatescribe Roh-Kalo
  Kel’Thuzad
• The Reckoning
  Sylvanas Windrunner