You would think so... But there isn't really clarity on the issue for the PS side now.
It's been asked on their forums, multiple times now, but no official word that I've seen yet.
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This is just speculation....but I believe that the 12am PST is intended for those who did not pre-order....which in turn means those who could not pre-load the game a couple of days early. Perhaps the standard, non-preordered version won't be available to even click to purchase until the PSN updates at 12am PST. That would make more sense to me, and make pre-ordering your anticipated games an even better idea.
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That would make sense.