All kidding, fun and pun aside:
My first impressions of the new Firmware UPGRADE (new features, so a bit more more than an UPDATE

) so far:
The new functions are extremely useful, the joystick-selectable AF points was the only real niggle I had with operating my 1-D MkIII, and I was one of the customers that emailed Canon about that after intensively testing a 1-D MkIII , even before I actually bought mine, Kudos again to Canon for listening

...
Being able to select AF points with the wheel while shooting in portrait orientation, and still be able to swiftly access EC while in Av or Tv is another real winner for *me*...
And finally: the AF adjustments: as I mentioned before, ServoAF is my least used AF method, but after the Firmware Upgrade it feels a LOT more steady: this afternoon I tested ServoAF w/the 100-400 and center AF point selected on my usual targets: airplanes flying by en-route to our countries Main Airport (my village is just between two landing 'legs' and we see them come by relatively low and slow

.
Performance was noticeably better than before: fast acquisition, and no hunting afterwards, no glitches from the subject and re-acquisitions.
I shot about 90 frames in series of 6 to 15, and apart from some of the first they were all well in-focus.
...so far, so good: other initial test reports I have read on DPReview indicate a similar improved behavior experienced by many other users
...but the report of the 1-D MkIII's 'hardest juror and most intense tester', mr. Rob Galbraith, is still not there, wonder what he will conclude

...
...for now, *my* €0.02...
Kindest regards!
Max@Home