Bought my 2007 JK while still in college so I logged many miles during its first year, now it is used more for rock climbing and hunting. Extremely tough and reliable, I installed a 2.5" lift and 33" BF Goodrich M/T's and it will take anything I can throw at it. Great fuel mileage given the use, and no mechanical problems.
Favorite features would be the new 3.8L. V6 that replaced the dated 4.0 L I6. The extra length and width makes it much more manageable on the road. Also the new high pinion front axle.
The only improvements I can think of would be to give it a 4.7 L. V8 option. Also, please build the truck version, the Gladiator.