Keystone Hero: Sanguine Depths

Keystone Hero: The Necrotic Wake -- [spell=354462]
Keystone Hero: Plaguefall -- [spell=354463]
Keystone Hero: Mists of Tirna Scithe -- [spell=354464]
Keystone Hero: Halls of Atonement -- [spell=354465]
Keystone Hero: Spires of Ascension -- [spell=354466]
Keystone Hero: Theater of Pain -- [spell=354467]
Keystone Hero: De Other Side -- [spell=354468]
Keystone Hero: Sanguine Depths -- [spell=354469]
Keystone Hero: Tazavesh, the Veiled Market -- [spell=367416]
Keystone Hero: Return to Karazhan -- [spell=373262]
Keystone Hero: Operation: Mechagon -- [spell=373274]
Keystone Hero: Iron Docks -- [spell=159896]
Keystone Hero: Grimrail Depot -- [spell=159900]
Mythic: Fates of the Shadowlands Raids -- [spell=373190], [spell=373191], [spell=373192]

Mythic+ portals will be account-bound in War Within.

From an interview with Ion Hazzikostas and Morgan Day during the 2023 BlizzCon.
Link here, you can find the question and answer at 15:06.