This posting describes the changes incorporated into GTX V8.02.
There is no operational benefit to you, but there are some changes that have been mandated by the FAA as discussed in this thread. Stated simply, the FAA wants all transponders to be reporting altitude (and whether the aircraft is on the ground or in the air) all the time.
As explained in this thread, we were doing free transponder software upgrades at Oshkosh this year and also at SNF earlier this year. We will likely offer them again at these shows in 2017. Your Garmin dealer can also install this software if you find that more convenient.