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 definitely why we do a beta test. We can also do things like reset the realm at a busy time like 4:30pm PDT to try and find the source of a certain issue where a crocolisk is losing it’s brain due to how multiple processes are interacting and mirroring code to form a cohesive world. There were similar types of issues like this back in 2004 but we wanted to try and resolve this one before the weekend for the folks who are testing.
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Nov 15 Classic was great, BC was better. IMO, BC hit the sweet spot in terms of content and gaming for WoW. It basically kept the core gameplay of Classic, but streamlined it for a better experience. Questing wasn't much different (still needed groups for hard quests), dungeons were still challenging (no LFD, heroics could be very difficult), and the raids were plentiful and required less people (25 and 10) Classes were much more balanced, specs were vastly improved (druids and paladins could finally tank and DPS as good as they could heal) In PVP, arenas are one thing I don't know if they should have ever added TBH. Some people might complain about the introduction of flying mounts, but I think it fit the expansion well. Also, Shattrath City was a great city hub! I enjoyed spending time there. Overall, I think it was the best WoW has ever been.Rhamus13 Nov 15
All the work we’re doing will ultimately allow us to recreate an authentic classic experience on a platform that is much more optimized and stable, helping us avoid latency and stability issues. Additional improvements will include modern anti-cheat/botting detection, customer service and Battle.net integration, and similar conveniences that do not affect the core gameplay experience.
A lot has happened in World of Warcraft in the fifteen years since it originally launched, and over that time we’ve come to expect certain things, not just in WoW, but in games in general. As players explore Azeroth as it existed back in 2006 during the WoW Classic beta, they’re reporting bugs – but in many cases, these ‘bugs’ are really just features that are working as intended.