These pictures will highlight the differences between the F and X Series.
The changes are mostly software, however there are a few hardware changes.
All software updates will be available to F Series owners with the 3.0 Update and will basically turn your F into a X.
The update product numbers are:
CNSD-100FM for the In Dash F Series (F700/F900/F90)
CNSD-150FM for the AVIC-F500BT Map
The update should be available around July. It's an SD Card Update ONLY. There will be an introductory price of about $70.