Latest news I have is that Mercedes is moving A Class production around between 3 sites in Europe (one is the former SAAB site in Sweden), and changing the proportion of diesels to petrol (what a surprise), so many previously quoted build slots are being revised..backwards.
I also discovered that many of the cars shown on the Mercedes New Car Locator website are listed based on delivery assumptions from the time of order, and are not updated so may not be there at all.
It is all rather disappointing: not until a car is on a transporter on the way to a dealer is the delivery date really trustworthy. It must be challenging for the dealers: I can see why they try to sell from stock and don't like bespoke orders.