Other than my concern over the 6.2L's existence, My 2nd concern was the FX4's wheels. I found this info and it appears the wheels pictured on the FX4 (the blue one) are the 17's. I don't like them. Here you can see the optional 18's and 20's. I really like the 18's, very close to the 04-08 18's.
http://www.trucktrend.com/roadtests/.../photo_17.html

My 3rd concern is why have chrome in FX4s taillights, when there is no other chrome on this truck?