Iris Pro 580 is only available in the i7-6770HQ processor which Apple doesn't use in their MBPs.
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Iris Pro 580 has been available for a few months now. The Intel NUC with the i7-6770HQ has it.
Yes, an Intel processor only available in an Intel machine. Show me ANY other machine that has it. List pricing has them in line with the first gen Skylakes so there's no reason for any manufacturer to NOT use it. But everywhere you look it's the 6700. Like I said, they may have 'launched' them, but I doubt they're available in anywhere near enough quantities for any manufacturer to use.