I am so happy to have stumbled upon this thread!
I placed my order for white/white M3P on Jan. 15 in UT in Tesla store. I specifically told the rep that I wanted 2019 production model. Then two weeks later I got an email for delivery date on Feb. 9. Once I got the VIN, I discovered, this was 2018 model. I immediately asked to cancel it to wait for 2019 model. I did not lose my deposit because of it though. So essentially, I've been waiting for my car since the start of February. I've been calling Tesla customer support as well as my local Tesla store in March but no one could give me any specific update.
I was told though that cars are produced in batches, meaning that some production output might be focused on MR or LR or P models and then also black interior might be produced before white. That might justify why it takes so long for white/white 2019 model to get produced. But it looks that some of you have gotten white/white performance with order date being later than mine. If on top of that these models are 2019 than I feel like being screwed.
I did receive a text message with delivery date for March 29 with no VIN. When I talked to the rep, she told me she'll still need to verify if it's indeed 2019 model. If it turns out to be 2018 again, I might develop some eye twitching.