There's no reason why it shouldn't, but yes, it's not impossible that something will break compatibility.
As Tom says, all the GDC has said on the matter is this:
Quote:
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The software we’re releasing for the 2013 season hasn’t been certified to work with Windows 8. This doesn’t mean it won’t work, just that we can’t guarantee it, and we won’t be able to provide anything beyond cursory support if you decide to use it. We will be incorporating testing with Windows 8 in future seasons
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