The Barrow Deeps
One of the two max-level raids Forever launches with. Reported as 10-player.

One of the two raids World of Warcraft: Forever launches with, for characters at the level cap. The picture is from Blizzard's reveal press pack.
What is confirmed. Blizzard's reveal fact sheet promises "an entirely new end game starting with two new max-level raids", and the press pack contains artwork of both. This is one of them.
What is reported but not verified. Beneath the ancient roots of Mount Hyjal. The raid is reported as 10-player; that size comes from our research notes of 14 September, compiled from panel coverage rather than from the game.
What we do not have. No boss list, no loot table, no lockout rules. The client data imported so far holds instance names but no encounter tables, so anything of that kind would be invention. It goes here when it can be read from a build.
Read the official source