My reservation moved from Oct-17 to Dec-17 to Nov-17 to Jan-18. I guess, I should assume the worse, but it does make me wonder why they listed Nov-17 as a possibility? It seems like this is a little out of step with communications during Q3 shareholder conference call. Plus, since you are communicating a delay, why provide a possible date this month unless you think that you might make that date? Providing a three month window starting in the current month seems a little strange to me. If you are going to deliver this month, then cars should be rolling off the line in big numbers, and I don't think that is the case. Plus I haven't been invited to configure yet, so seems really unlikely.
Note that I made my reservation on April 2, 2016 and I own a 2013 Model S. So I should have some priority, but I'm certain that there are others ahead of me in line.