Based on the timing of prior model releases, I suspect 2016 or 2017 is when we're likely to see a 5D4. I'd be a little surprised if turned up sooner.
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Personally if someone showed up and wanted to run an executable on my computer, they'd be shown the door.
They used the older 100mm macros, original or USM. They are fine for his purpose, but slow to focus at short distances.