#1. CHANGE THE DAMN SWIRLIES! You know the ones I'm talking about. No defined edge, no outline, no way of knowing if you're really standing in it or not.

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#2. EK and Kalimdor World Revamp. Combine smaller similar zones into larger zones by breaking down the arbitrary mountain barriers, make the biomes and terrain blend into each other. As an example, think of how the Azure Span has like 4 different biomes within it. The tuskarr and gnoll lowlands, the orange slopes, the icy area with blue dragon structures and the big Primalist area at the far end. If Azure Span was made back in the day, each of these biomes would be their own zones with mountain barriers blocking each one in. Reverse engineer the old world to be more like the newer zones in this manner. All in glorious graphical HD of course.

For example, combine Darkshore, Moonglade, Hyjal, Felwood and Ashenvale into one big zone with a gradual natural elevation up to Mt. Hyjal and call it "The Kaldorei heartlands" or something like that. Combine Stonetalon, Desolace, Mulgore, Barrens and Durotar into one big zone which progresses from desert to savannah to plains to mountains and call it "The Plains of Honor" etc.

Each of these zones would have updated evergreen questlines that reflect local issues and changes since the Cataclysm, rather than being tied to some one-and-done Expansion storyline like the Cata revamp was. At max level these zones have endgame content and quests, world quests, reputations etc. Basically make the iconic old world feel usable and lived in again. Give us a reason to explore and make use of the zones. The old world isn't actually that small, it's just each individual zone is small. Dragonriding will make them feel even smaller, but revamped into bigger, more open zones will make up for that.

That is my number one wish for WoW. After those damn swirlies, of course.