Blizzard have opened up an endgame testing realm with max level character templates, with players limited to Stormwind and Orimmar, and Solo Shuffle being tested this week.
Test Realm (Source)
We’ve opened the test realm Valdrakken for end-game testing, and it’s here that we’ll look for focused feedback and bug reports on end-game content. Testers on this realm are limited to only Stormwind and Orgrimmar, and can proceed using max level character templates.
To start, we’re testing Solo Shuffle. In future weeks, we’ll make this the realm where we test Professions, Mythic+, and raid content.