JustVince:
What inspires me a new question:
What should we update and why?
My personal opinion is don't upgrade anything unless you know it works for your revision of the board, and unless you really need the new version and aren't afraid to brick your board.
For me, with my original aurduino.cc boards,they work, and I see no reason to mess with it. I've seen too many stories of boards that don't boot after an upgrade.
On the other hand, if you ware willing to risk your board experiment for the sake of the community and to improve the documentation (like you did with the hardware differences report) then go for it (at your own risk, of course!)