Interesting, look at his wording at the bottom of the post about Black Temple and Hyjal.
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You'll be able to test Black Temple
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vs
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looking into ways of making Hyjal accessible on the PTR as well to get more testing
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Seems to me this means that BT does not have significant keying process, whereas Hyjal of course does since it requires Vash and Kael kills. The keying being the part they'd have to "look into" in order to put Hyjal on the PTR and allow *everyone* access to it.