**CURRENTLY IMPLEMENTED / IN-GAME / TESTABLE:** (This does NOT mean it's complete, just that at least a part of it is currently testable)
Features:
-Levels 81 & 82
-Goblins!
-Worgen! (Is it Worgen or Worgens?)
-Some of the stat rework
-Flying mounts in most of Azeroth
-Some new/updated maps
-New Race/Class Combinations
-New talent window layout
-New water graphics(For PC only)
-Most? of the Mastery System
-New Hunter Resource System (Focus)
-Some new talents/abilities for some classes
New Zones: (These seem to currently be the primary areas for testing)
-Mount Hyjal
-Vashj'ir
-Goblin starting areas including Kezan and the Lost Isles
-Worgen starting areas including Gilneas
Revised Zones - Kalimdor:
-Darkshore - Major
-Felwood - Moderate
-Azshara - Major
-Ashenvale - Major
-Stonetalon Mountains - Major
-Orgrimmar - Major
-Durotar - Major
-Northern Barrens - Major
-Southern Barrens - Major
-Echo Isles - Major -- Most has been reclaimed by the Trolls
-Mulgore - Minor
-Thunderbluff - Very Minor
-Desolace - Major
-Dustwallow Marsh - Minor
-Feralas - Minor
-Thousand Needles - Major
-Tanaris - Major -- DANGEROUS/UNSTABLE
-Ungoro Crater - Minor -- DANGEROUS/UNSTABLE
Revised Zones -- Eastern Kingdoms
-Trisfal Glades - Moderate
-Undercity - Moderate(mostly above ground changes)
-Western Plaguelands - Moderate
-Eastern Plaguelands - Moderate
-Silverpine Forest - Very Minor
-Alterac Mountains - Very Minor
-Wetlands - Major
-Loch Modan - Moderate
-Dun Morogh - Moderate
-Gnomeregan - Major changes -- Parts have been reclaimed by the Gnomes
-Badlands - Major
-Burning Steppes - Very Minor
-Stormwind - Major
-Westfall - Major
-Redridge Mountains - Very Minor
-Swamp of Sorrows - Major
-Blasted Lands - Major
-Stranglethorn Vale - Major
New Dungeons:
Blackrock Caverns - BRM lvls 78-83
New Battlegrounds/Arenas:
-Twin Peaks(unconfirmed but currently queueable)
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**NOT YET IMPLEMENTED:**
Features:
-450+ Professions
-Archeology
-Path of the Titans
-Most New Talents
-Most New Spells/Abilties
-Levels 83-85
-Rated Battlegrounds System
-Guild Advancement/Exp System
-New Badge Sytem
-Most new and revised maps
-Stat reworks(parts of the rework seem to be in, but not complete, im lookin at you block value!)
-Goblin and Worgen starting area cinematics
-Music in Worgen starting area
-Warlock Soul Shard System
Zones:
-Uldum -- Invisible walls block entry
-Grim Batol - Not in game
-Twilight Highlands -- Invisible walls block entry
-Tol Barad - In game but difficult to reach and not yet textured
-Deathwing Scar - Not in game
-Deepholm - Not in game
Unrevised Zones:
It is unclear which if any of these zones are meant to have revisions, but currently they dont show any signs of change.
-Outland & Northrend
-All Draeni and Blood Elf starter areas
-Winterspring (With the exception of Darkwhisper Gorge which is now considered part of Hyjal)
-Moonglade
-The Hinterlands
-Arathi Highlands
-Hillsbrad Foothills
-Ironforge
-Searing Gorge
-Duskwood
-Elwynn Forest
-Deadwind Pass
-Silithus -- DANGEROUS/UNSTABLE
Dungeons:
-Skywall unnamed dungeon
-Deepholm unnamed dungeon
-Throne of Tides(Implemented but critically bugged) - Vashj'ir
-Abyssal Maw - Vashj'ir
-Lost City of Tol'vir - Uldum
-Halls of Origination - Uldum
-Grimbatol unnamed dungeon
-Caverns of time unnamed dungeon
-Heroic Deadmines
-Heroic Shadowfang Keep
Raids:
-Skywall unnamed raid
-Blackwing Descent - Blackwing Lair
-Grim Batol raid
-Firelands raid - Hyjalish?
Battlegrounds/Arenas:
-Battle for Gilneas City
-New unnamed arena(s)
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**DANGEROUS/UNSTABLE AREAS:**
While there are bugs and crashing everywhere, these areas are particularly unstable and are almost guaranteed to cause major crashing - possibly to the point you cant log into the character anymore. I strongly recommend avoiding these areas until future builds.
-Southern Tanaris
-Southern Ungoro
-Southern Silithus
(These three areas appear to all be afflicted by a bug with the game attempting to load files related to Skywall)