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First off, I DON'T want stuff that competes with WoTC. I don't want new races, new powers, new classes, new magic items etc... I don't need it, because 1. it won't be easy to use it with the CB, and 2. I don't know how well it will mesh with WoTC's future releases. While you might have gone out of your way to make sure it works well with what's out there, and doesn't create any problems, WoTC most assuredly is NOT taking your stuff into account when it releases its next product.
I also want things like cities, and campaign worlds and kingdoms, but I DON'T want a lot of new classes, powers, paragon paths, and epic destinies... I want fluff, and descriptions, and at best I want to know how the existing classes and such fit within the city. If you decide to outfit the thieves guild in your city with an entirely new paragon path though... It's probably going to get ignored. (I even tended to do this in 3e as well. We played in the scarred lands setting, but almost never used the scarred lands crunch.)