WC3. What could have been... (I'm 100% satisfied with what we got though)
edit: Can't find any sources, but I remember reading in a magazine back in the day that it was going to have more races, and I think a much heavier RPG influence.
edit 2:
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http://www.hiveworkshop.com/forums/...warcraft-3-prerelease-material-thread-155117/
I remember hearing about that too. That being said, what was being proposed is kinda what WoW ended up being.