Problem, for me, is they designed this game too heavily around raids and dungeons. They built this huge world just for players to eventually (expansions later) be able to play without needing to go out into the world. Even when they’ve tried to get people out in the world it’s either poorly done, shallow, pointless, or a mindless daily that you “have” to do to power up the newest xpac system.
So I imagine Classic + just adds more raids and dungeons like any other expansion. Hell, they’ll probably sell it like an expansion, too.
It’d be cool if they actually did something fun with classic, like storyline change and even design change like not basing the game around dungeons/raids, imo. But I have no faith.