AppleInsider reports:
According to AppleInsider informants, the new keyboard is a full-sized, extended keyboard featuring a normal sized arrow key block and F-Keys, as well as page up and down keys. Additionally, the new peripheral is said to sport new multimedia keys, similar to those on Apple's PowerBook, for adjusting display brightness and contrast and system sound.
There's also word of G4 processors and larger HD's in the new machines.