In terms of what the World of Warcraft Classic Best Classes are, Warrior and Priest stand out almost instantly. This is partly due to the fact that Protection Warrior is the only viable Tank Class in WoW Vanilla Patch 1.12. Both the Proc Warrior and Priest are required for Raids and when combined in a PVP setting can be a fierce combo on the battlegrounds.
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.
Logging in for the first time, being welcomed by THAT login screen and THAT music... You can't not be taken back if you've played Vanilla, and especially if you've played 2 years of it non-stop all day every day. I probably stayed 10 minutes in character creation just because of the music alone (and trying to get my character looking exactly as it did back then - although I wasn't a shaman then). The whole intro experience was especially amazing for me since the Tauren starting zone was my first encounter with WoW in the EU beta, and a little bit of that spark did return. But is that all Classic has to offer? A trip back in time when we were wowed by the game for the very first time?
Other methods have been discussed. For example, mods could be crippled. DBM didn't exist back then, and the other boss that did that I don't remember the name of, didn't do as much back then as DBM does now. If our goal is to recreate the experience as it was, then obviously not having DBM would be a reasonable way to accomplish that. DBM simply existing, makes the game today easier than it was. So disallow it. Again, this is completely consistent with the spirit of vanilla. Remember one-button-decursing? That was nerfed. They crippled the capabilities of the modding API to disallow that because it made the game too easy. So what if they cripple it a little bit more to once again make the game less easy?
Blizz stated in a watercooler that they're using the 1.12 database as a starting point. I don't think it's a stretch for people to assume that most game features and mechanics will be in their 1.12 state. The kind of stuff I would expect to see reverted would be numerous AV changes, but I seriously doubt class mechanics are going to be reverted. I'd be surprised if the threat changes that ruin pre-naxx encounters are reverted.
This is, in my opinion, the largest change that WoW Classic will have over Vanilla, and it’s something that simply can’t be undone. Back in Vanilla, guilds were very secretive over strategies of how to correctly defeat a boss. Videos of boss kills were virtually non-existent,and strategies on how to itemize and play various classes and specs were hard to come by, especially for newer players. This, in addition to the unforgiving raid requirements and difficult content, lead to a lot of the player base never really getting to see a lot of the endgame content. Those that did rarely ever did so efficiently, and it wasn’t uncommon for the best guild on any given server to take months to complete a raid tier. There is absolutely no way that this happens in Classic. The raids in Vanilla are very much a solved system by now. Every raid, and every boss and trash pack inside, has been thoroughly strategized and talked about to death over the last 14 years. Rest assured even if you and your friends never played Vanilla, someone in your raid party will know exactly what to do on every boss, exactly when the trash packs are going to respawn, and exactly what buffs and gear to get to prepare. That certainly doesn’t mean thatClassic raiding will be a cakewalk, but it will be different than how the majority of people stumbled through the content.