Me Personally…
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Ascension but with a few Retail features like the modern day Tmog/Barbershop,
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with the Worgen/Goblin/Pandaren Races,
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Maybe new races like Naga and Orges,
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World Quests but reworked to work as it did in GW2,
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Bigger emphasis on Professions
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and have the new zone be the unreleased Emerald Dream.
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… And maybe have Steward Copeland as well Peter Neff and Kenneth Burgomaster in the soundtrack composers. Mid Flute and Platform Peril for Life!!
That’s just a start for me, but it’s the basic jist.