Mine is in for the same problem, but I wasn't as lucky as you. I was driving down the road in D and P400 as I had a few calls to make and didn't want to have to shift gears while on the phone and the car was still cold. About a mile into my journey I came to a stop at a red light and the car went into neutral. The light turned green and I was unable to get the car to shift back into D. A few transmission errors popped up on the screen, but to be honest I wasn't paying much attention to them as it was rush hour and cars were flying by me on both sides.
After trying to start the car a few times I gave up and dialed 911 to get some assistance moving the car off the road as it was a danger to myself and fellow motorist. While I was doing this I kept trying to start the car, and luckily it came back after about five minutes. I was able to drive it about a quarter of a mile to a gas station. The car would not leave first gear and wouldn't go over 20MPH.
When I got to the gas station I shut the car down and called my SA. I tried for a few more minutes to start it and finally gave up and called a tow truck. Of course they didn't send a flat bed, even though I requested one and told them what kind of car it was, so I had to send the guy off and wait another thirty minutes.
The gentleman that came with the flatbed did an excellent job of loading and unloading my car. He used 2x6 planks to ensure that the bumper did not scrape, and he fastened each wheel to the truck. I of course let him know how much I appreciated his work and kindly tipped him $20.
I called my SA today and he said that it would most likely be ready to pick up tomorrow, Friday at the latest. It will be a week tomorrow, and to be honest I have never missed a car this bad. On the bright side it should feel like a new car again since I have only had it for a month, and of course the repairs were covered under my factory warranty that is intact until 2/2/13.