I don't understand why everyone is labeling the Windows 8.1 RTM WZT copy as WZT. The Copies WZT "leaked" are the official ones being handed to the OEM's. That means there will be some patches then release for the public will be out.
Not even the WZT leaks will be affected with getting some patches after GA or shortly before. All machines which are currently produced by OEMs have the same os on board and when booted the first time, a bunch off updates will fly in. That easy