Some answers to the above questions.

1) This transmission software is specific to the 4.4i "valvetronic" engines (first released for MY 2004). Apparently they struggled with different updates to the software, and only recently "got it right";

2) The software fixed two "known issues" that I'm aware of
a) "smoothed" acceleration from a stop, in my case virtually eliminating the hesitation that many experienced (including me) with the "new" 4.4's

b) fixed the "sudden clunk" that commonly happened when acellerating on a steep incline, especially if one had released the accellerator and then re-accellerated (if that makes any sense).

3) The software was installed/updated at no charge under warranty

I will check on my service receipt to see if they have a software version # denoted.

Trust me, it's worth it!