Not sure I believe this or not but a member of the Tivo team, in Manchester I think, told me that all Pre-reg customers will get a call within the nex couple of days. He said that they had almost finished the list and that if you haven't received a call it will be by the end of Monday 14th Feb.
I still haven't had a call, I am on the VIP50 package and registered on the day the website launched. I think the whole pre-launch scenario has sucked big time but it is their piece of kit and they can do it how they want. Looking forward to getting TiVo eventually though