Limited edition?
First off you shouldn't ever go by what your dealer says, get the production number/last four of the VIN and track it yourself. Second, do a search and find the normal wait times at each stage of production then see for yourself where you stand time wise with everyone else. Normally the whole process takes about 6-8 weeks. So if your CA told you 6 weeks then switched it to 8 weeks it could still be on schedule, delay is normal to a certain extent. Maybe the production got delayed for whatever reason or its just taking too long to get on a ship in Bremerhaven, or even waiting long at VPC (which could mean your car may have been damaged upon delivery). Theres so many stages where it can be delayed, its hard to pinpoint the reason without knowing in which stage of production you are.
Cheers