What were you hoping to fix with the new firmware? I sell enterprise software as my primary living and most customers do not want to be the early adopters of a new release. I want to fix the focus performance with a speedlite AF-assist beam but do not want to get new problems.
I second Polarized's viewpoint. I developed enterprise software for the past two decades and now oversee the architecture of such solutions.
In order to have a less error-prone upgrade or introducing odd behavior, I would recommend to anyone here that is upgrading their firmware to explicitly right-down (or take screenshots) of all settings and custom functions and then clear the entire camera back to factory defaults after you have upgraded the firmware. Then, re-establish your settings.