It would as november is in Q4 and the letter should come soon. You can test drive and put an order on the system, but not complete it, till the date mb say in the letter.
I test drove my current car in late sept for ordering in jan 2020 for april handover as i was sick of test driving in the cold of winter and the dealer told me if i want a certain spec, that was being removed from uk sales and was one i wanted it could be ordered now and they’d speak to mb.
When i went back to actually order it in jan they was have you placed an order for another car as just before xmas i popped into vw to get a new wiper and had a look at a few cars while we was waiting and the guy there put the one i was intrested in on the system as they was getting in short supply, just in case i wanted one.. without telling me.. so i was shocked abit but, if i had wanted to go for that one and none was available at time of ordering, that would be worse. So can be a bonus looking and deciding early.. I think what some mean is if you wait till q1 prices may change you never know. but i dunno maybe call mb explain when your due, and see if something can be done, or maybe the dealer can take you info and stuff and place the order on the day of ordering. hope all goes well for ya..