PHASED CONTENT ROLLOUT – Following its launch, World of Warcraft Classic’s content will be released over the course of multiple phases reflecting the game’s original order. Re-experience WoW history unfolding as heroes gear up for Blackwing Lair; players battle for PvP Honor and Rank rewards; and entire realms band together to open the gates of Ahn’Qiraj.
Kaivax, a WoW forum community manager, revealed that WoW Classic's class design, battleground mechanics and stats on existing items will be set to their 1.12 state, despite the game releasing content that expands beyond that. This removes "progressive itemization," so if the stats on a specific piece of equipment was changed during the original updates, that won't take effect in this version.
That's not to say that everyone has an unrealistic vision of what vanilla WoW was like. There were already plenty of people on the WoW Classic forums pointing out that perceived bugs are just recreations of the original game. And as noted before, a flaw to one player is a key component of the original positive experience to another. WoW Classic will surely please plenty of purists in spades. But this goes to show that it won't be for everyone who has fond memories of the game circa 2006.