Only visual difference (with radio off) is the center top button on the NON-GPS radio is black and on the GPS version it is silver.
As to the readout.......................since the screen is STILL the same size all you get are some arrows and small symbols (Black LCD on Green-as the regular radio has).
One thing that is cool is that there is Voice that tells you what to do..............Turn Left at...
When compared to the full color three dimensional GPS in MANY other cars, it's hard to justify the $1200 option.
BUT........................................the Radio does sound MUCH better. I couldn't find any specs (yet) but it definately sounds better that the Original Radio.