Here comes the first big raid test for the 8.1.5 raid, Crucible of Storms, featuring both bosses, the Restless Cabal and Uu'nat in Heroic on select dates and times, followed by Normal mode for the rest of the weekend!
Raid Testing (source)
On Thursday, February 21st we will be conducting a Heroic raid tests of Crucible of Storms. After testing has ended on Thursday, we will open the zone on Normal mode until Monday, February 25th.
Thursday, February 21st
The Restless Cabal - Heroic Crucible of Storms
13:00 PST (16:00 EST, 22:00 CET)
Uu’na