I wrote a bit on the new Apple Keyboards
in my forum, I will post some here
(too lazy to re-write the whole post).
The wired one is full size keyboard, while the wireless one is compact version.
As Parker pointed out,
The volume control and eject keys above numeric keys are shifted to function keys F10 to F13., and the “help” key is now a “fn” key.
And there are new special functions above the main typing area.
For more information, please visit
Apple Keyboard.