It seems that they are catching up. I ordered a coupe with M-DCT and 19" wheels and started with a week 19 date (order placed on 2/21/08). This went to week 15, then 14 over the next two weeks. I didn't check for about a week and half and then my car was already in production status 151 and is due to be completed tomorrow (3/31). Thus it was actually built in week 12/13 production.
ShadeM3 - my advice is to check again this week. You are likely to get a date but don't be surprised if it moves up. This is important if you are contemplating any changes in your order. I was all set but would have missed the lock-in date if I had been waffling between options.