Blizzard has pushed WoW Classic update 1.15.3.55009 to their internal server. Currently, Season of Discovery Phase 3 exists on version 1.15.2.55002, so this first iteration of Patch 1.15.3 may indicate that Blizzard has begun internal testing for Phase 4.
The development team stated that Season of Discovery Phase 4 would be delayed to attempt a smoother launch than Cataclysm Classic has had so far.
WoW Classic Senior Game Producer Josh Greenfield stated that the team is making progress with Phase 4, and that they will share more information when it is ready.
During BlizzCon, the Karazhan Crpyts were teased as a possible piece of endgame content in Season of Discovery.
This internal update may be the first PTR that players will be able to experience from Season of Discovery, which will include the newest level 60 Runes, but won't spoil new content in the game. What are your expectations for Season of Discovery Phase 4? Are you enjoying Cataclysm Classic or Mists of Pandaria Remix while waiting for level 60 endgame content? Let us know your thoughts in the comments down below!