Just to add to the confusion, I just got back last night from my ED of my 550i xdrive. The guy introducing me to my car was Benjamin. I specifically asked him what engine was in my car. He said no one had ever asked him such a thing. I told him that I was an engineer and was interested in details and if my engine had the valvetronic technology. He left me there with my new car for 20 minutes and talked on the phone and came back with a yellow sticky which I just stuck in my pocket and drove off into the German sunset. All it said was S63B44TO with valvetronic. After a few moments on the web looking at this that night I wish I had just gone back and asked them again as that is what is in the M5, etc. In my dreams that would be true, but seem unlikely, but that is what I was told at the Welt in writing if a sticky is writing. Fastest car I have ever owned but is was just out of the break-in period at `1200 miles when I turned it in but I do not have calibrated accelerometers build in.
It did not have the 3 electronic dash boards reported earlier. I was told that that was just coming out on some of the 7 series.
In an earlier post, I had asked my CA, David Aviles and he asked the regional tech guy who refused to give an answer.
It will be here in a couple of months and perhaps they will clarify by then as there is a lot of conflicting information out there.