*Update*
I called because I originally said no trade but now I'm considering trading in my BMW (lease return scheduled for December, but the numbers look like I would save a whole bunch of sales tax and qualify for an extra $3,000 rebate from MD if I trade - depends on the trade-in offer of course). I wanted to make sure I was still able to add a trade with with where I am in the process.
The rep on the phone was extremely nice and informed me I have a VIN assigned and the vehicle is "ready for transport to the compound" which means through production and on to quality checks...
He also said I have an IDA assigned and gave me his name and should expect a call in "days".
I made sure to thank him profusely.