Although I haven't experienced the gas pedal flutter, I just had my transmission updated to the latest software. The TSB number was 09-18-3. Update was done on 10/13/09. I'm not noticing any problems with the transmission.
The flutter you feel is the ABS check. The software update will make it less noticeable is all, nothing wrong with the car. If you had the EPAS recall done, it should have the current software, otherwise you will have to pay for the update. TSB is not a recall.