Like you, the only notification I've had is from the dealer I placed the order with. You should be able to get a screen shot from the dealer of the order showing all the details. My dealer is happy to send them through as often as I like.
The last one I saw had the full details of build date and expected delivery date which was the start of August for the build and the start of September for delivery.
If you are panicky it could be worth asking for this just to put your mind at rest. If I can find the email with the attachment I'll try and add it on
335d XDrive M Sport Moonstone
with Black Merino Leather interior