Official WMF exploit patch leak

It looks like, the Windows patch (or a beta) for the WMF exploit has been leaked online. It sounds as though Steve Gibson got a hold of a copy and has tested it along side the unofficial patch. All seems to go well. He notes that the build date was December 28th. So, they have been on it since very early on. That's reassuring. It would be nice if their testing process could be a bit streamlined though.

I do wonder about the "leaking" of the patch - Microsoft officialy recommends against trying it. (I would too - stick with the unofficial patch until the new update is ready.) I wonder a) what kind of testing structure they're putting it through and b) what the harm would be after doing initial testing to make sure it didn't cause crash/burning/"oh the humanity" release an early version through a registered hotfix download. (Let people give contact information, receive a download link and then follow up with did it work, what problems/etc?) (Of course give appropriate disclaimers as well...)

I've heard references that it might come out earlier than Tuesday, but I think that was just speculation.