Releases according to their status on Intel's site? Yes.
Are there any computers from any company shipping with those CPUs yet? Nope.
Of course, but you can't really compare to other manufacturers since they don't really refresh their lines as fast as Apple does, history is evidence. Like I've stated in this thread, I doubt it's the CPU holding them back.
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Maybe an added BTO option after the release, added quietly?
Well I think it can be a possible candidate for the highest spec rMBP 15" if it releases after or during September. So that makes the 4850HQ Base, 4950HQ Mid, 4960HQ High. However they could always introduce it early or maybe as a BTO but I think they won't update them until Haswell v2 at WWDC 2014.