I had the update yesterday, right away I noticed how it shifted much more smoothly. I keep the avg. mileage readout showing and it now updates constantly whereas before it seemed slow to do so.
It does seem to rev up higher before shifting, likewise it is much quicker to accelerate.
I was told the PCM? was updated, the brain that controls the car. I took in a copy of the drive cycle when I picked it up and was told the tech had done it. It did have 6 miles put on it while at the dealer.
Luckily a service person knew exactly what update I needed so there was no problem getting it done.