It looks like EA has been busy with the Dr. Pepper promotion since the last time I checked! According to the following video, it appears that EA has created a couple of new Rabbit Holes for those who enter the codes from the Dr. Pepper coke bottles (US only) as well as a few new items and wallpapers. While checking the official EA / Dr. Pepper promotional site, I see the new items, but I do not see the Rabbit Holes. But I suppose they do exist if the video is true.
Credit goes to both Frankie, Cutsocks and to alanishead for the information on this!