From some of the literature I'm seeing about the upgrade, it mentions "A new AF Lock setting also lets you change the image framing while holding the desired focus." To me, this implies that they'll be an additional item in menus and hopefully that can be one way to discern if a particular C100 Mark II has been updated or not.
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Ricky
EOS 5D IV, EF 50mm f/1.2L, EF 135mm f/2L, 600EX-RT (x6), ST-E3-RT
EOS C70, RF 24-70 f/2.8L IS, EF-EOS R 0.71x
