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.
A demo of the game was available at BlizzCon 2018, and was downloadable on home computers for anyone who purchased a BlizzCon ticket or virtual ticket. The servers became available when Opening Ceremony started at BlizzCon 2018 and was set to end on November 8, but was extended until November 12. Players started at level 15, and the only available zones were Westfall and the Barrens. It was based on patch 1.13.0, essentially patch 1.12.0 ported to a modern infrastructure. The first day of the demo, there was a playtime limit of a cumulative 60 minutes with a cooldown of 90 minutes, applied through the BlizzCon Exhaustion debuff. The debuff was removed on the second day of BlizzCon 2018.
Nov 15 C2C interview with Theloras aka ME Hey everyone, Earlier today I spent some time with the Man, the Myth, the Legend who is Countdown to Classic and we spent some time discussing what I and many other Paladins are most looking forward to in the upcoming WoW Classic demo that will be available during Blizzcon: https://www.twitch.tv/videos/325334774 Since it looks like just Elwynn Forest for the Alliance and Durotar for the Horde will be available to play/test during the upcoming demo/beta, only early level gameplay will be possible to test at any length. But even with that limitation, a major core mechanic for Paladins will be able to be tested and theory crafted. I am of course referring to JUDGEMENT STACKING which I outlined in the thread below along with several other mechanics/talents/items that are still lingering and unanswered questions: Proc Items + Spell Dmg + JotC stacking? https://us.battle.net/forums/en/wow/topic/20760205815#post-1 TLDR - I found actual Vanilla era evidence (posted in the thread above) which stated that all ranks of each individual Judgement stacked with one another - Judgement of Light (JoL), Judgement of Wisdom (JoW) and most critically in this case, Judgement of the Crusader (JotC): With pvp gloves, libram and 3/3 imp JotC = +829 holy damage JotC R1 +79 Holy Damage JotC R2 +90 Holy Damage JotC R3 +113 Holy Damage JotC R4 +148 Holy Damage JotC R5 +182 Holy Damage JotC R6 +217 Holy Damage Since rank 1 Seal/Judgement of the Crusader is learned at level 6 and rank 2 is learned at level 12, if Elwynn Forest ends up being the only zone open for testing, then reaching level 12 is definitely doable from quest turnins and XP from mob kills. Which will allow 2 Paladins to join as a group and coordinate each of them putting up rank 1 and rank 2 of Judgement of the Crusader accordingly. If this proves to be correct, then it would forever change the LOLRET Meta with the simple fact that the more Retribution Paladins you have in a group/raid, the more powerful each of them then become and would also allow other class/specs come to the forefront as well namely Discipline Priests spamming Smite. At any rate, the twitch interview link is above - we had some audio technical issues at the start so if you fast forward to the 5:00 mark - you can hear the full interview. PS as a bonus, later on in the interview the Crazy OOMkin named Keftenk makes a special guest appearance :) https://twitter.com/count2classicTheloras111 Nov 15
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To fully understand the interplay, consider terrain. This includes the placement of hills and valleys, trees, buildings, and more. When hooking up the old terrain data files to the new modern game system we realized that the way the system looked at the shape of data was different. This resulted in the updated system and classic data not aligning, resulting in weird issues like Kolkar campfires underwater or burnt-out trees from the Cataclysm era appearing in the original world.