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.
HOWEVER, I did find out that there was an exploit to get around it (one of those rare exploits where you would WANT a bit of lag). Basically if you spammed “X” to sit/stand/sit/stand, then if a mob hit you while you were sitting and right as you were standing up, then it would register as a crit, but on the server side you would be standing, thus allowing the ability to proc.
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.
14 Nov Alternative to sharding? Both Tips out and Preach have suggested in videos a solution that may ensure a good launch experience, without the use of sharding. And i think they might be on to something! I tried to look it up on the forum to vote, but dint find any, so posting this. The idea is that Blizzard at launch can release multiple servers with the intent that at later stage merge them. e.g Sargeras 1 - _ Sargeras 2 - _ > Sargeras Sargeras 3 - I can see that sharding is practical, but it removes some immersion and might even be destructive to the community! I think this sounds like a good middle road. Preachs video https://youtu.be/BpdfIBt0Zs0?t=1039Stora27 14 Nov
There’s a whole list of websites that are trying to compile the working addons for the WoW Classic beta. The easiest one to parse through is Will It Classic. The site has a list of addons — including a search function — and has color-coded each one to signify whether or not it’s working on the beta client. Keep in mind that the client runs on the Legion API, so there are a few semi-current addons that work without any tweaking by their creators.
14 Nov Classic WoW alternate timeline Hi, I'd love to hear some players opinion on the following: WoW Classic to be an alternate timeline. Players stay at level 60 and further content will be developed. Like different Raids, Dragon Isles, that weird Snail-Like-Building for possible old god content, Mount Hyjal, Dead Wind pass. Devs could implement all the old stuff that was planned for Vanilla wow. Deathwing... Azshara Battleground. Or staggering release of Expansions until Wrath of the Lich King? (Personally I wouldn't like that.. I'd rather stay in Vanilla forever... like until I'm a old man in my 80s dying while goldfarming or something.) Or just straight staying on the Naxx Patch forever? My favourite would be having a long time for the Naxx patch so more ppl can kill Kel'thuzad and then developing this unplanned content sounds like a very very awesome Idea for me. Having a level 60 alternate timeline to current wow would make it even better. Greetings Dandin (name of my first char ever :) )Payneprime34 14 Nov

Nov 15 Looking Forward. So simple fun thread to see how you all think and feel. Name 1 thing you are definitely looking forward to, preferably not the obvious stuff but whatever go wild! I'll start with one. Professions aiding in immersion. Not sure if many noticed this but something I am excited about playing a hunter is the professions and how they aid in immersion for the hunter class so freaking well. All of the secondary profs help hunter immersion. Cooking, Fishing and First Aid all actually fueled the hunter lifestyle. Add in Skinning and Leather Working and it's straight up Hunter RPG.Melaned22 Nov 15

Similarly to Alliance’s Paladin, Shaman is a unique class option for Horde. Shaman boasts amazing group utility with its strong buffs through totems. Windfury totem is a must in any raid while Bloodlust in Classic is unique to the Shaman class. Restoration Shamans were considered the best group healers while other specs were also amazing in PvP environment capable of dishing out insane burst damage. Additionally, Shamans were able to wear mail armor, so any piece with spell power on mail set piece was almost certainly yours.
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.