Another raid testing weekend is on its way, as well as the first Mythic raid bosses to be tested. Check out the schedule for the next few days!
While nothing has been set in stone, it looks like testing each weekend is becoming more common for Blizzard to implement on the Alpha servers. Let's hope they keep the tests coming frequently!
Watcher on Raid Testing 8-11/04
On Friday, April 8, and Monday, April 11, we will continue our Legion Alpha raid testing.
Remember that Heroic difficulty scales for any group size between 10 and 30 players, so feel free to assemble and bring a group of any size within that range. Mythic, of course, requires 20 and does not scale.
Friday, April 8
Elerethe Renferal - Heroic Emerald Nightmare
13:30 PDT (16:30 EDT, 22:30 CEST)
Dragons of Nightmare - Heroic Emerald Nightmare
15:00 PDT (18:00 EDT, 00:00 CEST)
Monday, April 11
Nythendra - Mythic Emerald Nightmare
13:30 PDT (16:30 EDT, 22:30 CEST)
Ursoc - Mythic Emerald Nightmare
15:00 PDT (18:00 EDT, 00:00 CEST)
As always, this testing schedule is very fluid and subject to the realities of an alpha environment. We might have to change the time of a testing session, change the boss being tested, or cancel a test entirely, due to bugs, server hardware issues, etc. Keep an eye on this forum for the latest information, and thank you in advance for testing and providing feedback.
Q: How do I get into the raid zone?
A: In Dalaran, Orgrimmar, or Stormwind, you may speak to Nexus-Lord Donjon Rade Sr. in order to teleport into the raid zone while it is open for testing. (The option to teleport into a zone will not be available when the zone is not open for testing.)
Q: What character should I use to test the raid?
A: Whichever you prefer. We will be scaling players' effective level to 110 for raid testing, and their item level to an appropriate threshold for the encounter(s) being tested.
Q: How long does testing last?
A: The primary purpose of testing is to give us the information we need to balance the encounters, evaluate how mechanics are playing out in practice, and identify bugs. Once we're satisfied that we've received that information for a given boss, we'll be shutting down testing. Usually this takes anywhere from 45 minutes to 2 hours, but there are no guarantees.
(source)