Tauren’s hitboxes and their melee reach is slightly larger than other races. Being critically struck while using /sit to sit does not cause abilities like Enrage, Blood Craze, and Reckoning to activate. Using the “Automatic Quest Tracking” option does not auto-track newly accepted quests. (It instead will start to track an existing quest once progress towards an objective is started.) Warrior health Regeneration is working at the expected rate. Quests objectives and points of interests are not tracked on the map or minimap. Completed quests are marked on the minimap with a dot. (and not a “?”) Feared players and NPCs run fast. Standing on top of other players while facing away allows spells and attacks to be used. Creature respawn rates are much slower than in Battle for Azeroth. NPCs which offer multiple quests may inconsistently display them as a dot or a “!” on the available quests list. They were inconsistent in 1.12, and we’ve reproduced the exact inconsistency they had back then. Quests that are too low level for do not show up as a “!” in the game world. Available quests do not display a “!” on the minimap. On level up, the message: “Your skill in Protection increased to 15” was added in 1.12.1, and we’re intending to keep that. We appreciate all of your feedback!
This is another one that will most likely be a boon rather than a bane to the player base, though time will tell just how 14years of experience will affect the economy of Classic WoW. There has been no concrete word on just how AddOns will work in Classic, but if the infrastructure of the game works the same as it does in retail, there is a good chance that most of the mods that work in retail will work in Classic. This means that quite a few people will be running around with a whole host of gathering, crafting, auctioning, and gold making mods. Now, those mods did exist back in Vanilla, but not in the same way they do now, and not as many people had them back then as will in Classic. This will drastically affect how effective the auction house will be, and hopefully will affect the economy as a whole in a positive way. Another thing that will most likely see a large increase in popularity is carry runs. These have steadily grown in popularity since Vanilla, and rest assured with the old 40 man raid size that there will be quite a few “Molten Core full carry master loot ON PST for prices GOLD ONLY” being spammed in trade chat. Whether tokens will be available in Classic has yet to be discussed, but if so it will have an enormous impact on the economy of Classic. This, in addition to the differences I will cover in the next section, will have a pretty large impact on the endgame of WoW Classic.
Blizzard said it will choose players who have active subscriptions to the regular game based on a variety of factors to help them test the beta. It could be based on your PC, your commitment to the game, or just your luck. If you get in, you’ll likely receive an email, but if not, you can check your launcher. And remember: as with any beta, your progress will not be saved for when the game launches later this year. 

The original World of Warcraft was released in 2004, and World of Warcraft Classic aims to recreate the state of the MMORPG before its first expansion, The Burning Crusade, was rolled out in January 2007. Previously, players looking for a “vanilla” version of the game were only able to experience it on custom servers such as Nostalrius, which Blizzard shut down in 2016 to protect its intellectual property.
Only really to expand on Gráinne's comment as regards the 'collecting' and 'roster development' sections - which are, as said 'distinct' although they are intrinsically linked - I would like to point you in the direction of the in-game Achievements > Battle Pets > Collect tab. There are a series of achievements called Raiding With Leashes, pretty much all of which can be completed via the auction house - if you have the gold/inclination - or by completing old raids.
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