Well unclass info on the E-3G
is still somewhat in-the-dark i.e. not for me to make available on here
but the G is getting another scope, cockpit improvements, newer and rearranged internal cabinets and some other stuff for the block 40 upgrade. Look for ops around 2010. Also it will just be "G" as all US E-3Bs and E-3Cs will be upgraded to the same standard from the current block 30/35. I think eventually NATO will follow suit, though first NATO is going to put in the extra rear bank of consoles that the US currently has.
Ciao, and Hook 'em Horns,
Capt-AWACS, King of Belize, Viceroy of Texas, Protector of the Faith