Honestly they just need to apply the Arathi/Darkshore formula to all zones from Kalimdor/Eastern Kingdoms and maybe even Northrend if they have the ressources. HD revamp, Rare spawns that drop mounts and toys, treasures, worldquests and maybe one bigger story zone questline that tells us what the current status quo of said zone is that leads into a Dungeon. Together with pet battles this would create evergreen content and a fresh way to level new alts.
Other things I would like to see in 10.0 (but I know we prolly won't get it ...):
- HD update for Classic/TBC mounts with additional new tints to farm in the world
- Covenant Allied Races (either as pre-order bonus or for 9.2.5)
- Solo Q for RBG's (I don't really care about arena, but there should be a way to get rating in battlegrounds without having to form a group manually. Make it so that only solo players q together and change the rating formula and you can revive the classic bg feeling)
- Class Skins that use the underlying mechanics of a class to make something new that would be too niche for a full class so you don't have to worry about balancing. F.e.:
Hunter -> Dark Ranger
Monk -> Blademaster
Druid -> Tinker
Warlock -> Necromancer
Shaman -> Spellblade
Paladin -> Voidknight
Mage -> Azuresworn (basically blue fire)
Demonhunter -> Night Warrior for Alliance (use Tyrandes star form instead of Metamorphosis)
-> Shadow Hunter for Horde (use Troll Loa forms instead of Metamorphosis)
- a third spec for Demonhunter that uses a bow (inspired by Hearthstone)
- Seasonal Elite sets for M+ (I wouldn't mind if they re-use the pvp appereances tbh ...)
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Cata had a great start but the last patch was quite bad outside of the Dungeons.
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I wanted to say we already have that in Korthia but these weird trees have parts were you definitively can't walk on them and just fall of randomly ....