I had the previous DME update, I think it was last Fall, and I will agree with nberry that it was a noticeable improvement, but certainly no cure. Since then I have complained regularly about the hesitation and I've always been told there were no further fixes. When I took it in for an oil change at 10k I complained of hesitation and my resulting repair ticket said something like "customer complains of hesitation; tested vehicle; vehicle functioning normally".
I took it in again Monday for two new tires, the emergency brake recall and the rocker guards (photos later) and again complained of hesitation. This time the complaint was not on the repair ticket, but, I was able to peruse the attached mechanic's notes and found the note "DME updated". I asked the service advisor about that and he said yes, there was a new update available and it was installed. He said they always check for updates, recalls and TSB's whenever I bring my vehicle in and if something new is available, they install it.
The result? Well, I have only driven a few miles, I picked it up this afternoon, but the throttle response is noticeably improved. It is now similar to the PSM OFF without the annoyances. Actually better off the line. No hesitation off the line!
This is preliminary. Give me a couple of days to test it. In the meantime, has anyone else heard of this new DME update?