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Yes, and no.
If you sell it as a product that uses MediaWiki, you have to offer the modified code, or the plugins which enable it to work with what you're doing. For this purpose, for most tasks, people will offer their small shims which allow their proprietary product to hook the original code base.
So, so long as you write it as plugins, anything you add is pretty much yours unless you directly interface it with the GPL. LinkSys, Apple, and others have been using this way to skirt the GPL "ALL OR NOTHING" intent for years.
However, if you find something in the BSD code, man, it's truly free.
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