The deployment of WoW Classic takes place in 6 phases distinct. These phases allow players to gradually discover the content vanilla of World of Warcraft and Blizzard not to open everything at once.
As a reminder, Classic is in the original version 1.12 and the differences between Classic and its version of 15 years ago are minimal and do not impact the gameplay which was the main intention of Blizzard-. For the most curious, here is a comprehensive list of differences between Retail and Classic.
Phase 1: Launch of WoW Classic
Heart of Magma
Den of Onyxia
No ranking system or rewards. We kill for pleasure.
Article BFA version, it will be updated for Classic Coming soon
Valley of Altérac
Fields of war
War Field (Presentation BFA version)
Temple of Ahn'Qiraj
Ruins of Ahn'Qiraj
Tier X Armor, 5
Improvement of the loot system
Potential addition of sellers available in later versions of Vanilla, including spell penetration jewelry
Phase 6 will also be accompanied by the Scourge Invasion in Azeroth as well as Wild PvP Targets in Silithus and Eastern Plaguelands.