Yesterday it said "probably tomorrow" and since this morning it says "unknown". I ordered it 4 hours after the announcement, but I guess that wasn't enough.

Until yesterday status 2.5, today unknown again. Digitec's expectation management is disappointingly poor

I don't think you will be notified, but you should see your own delivery date in the order, according to the following answer from Fabian:

Hi, is there any way to know if we will receive it in the first batch?

Yes, the expected delivery date shown in the customer account in the order shows the more accurate date as it takes into account the unit or queue ordered. The date on the product page shows the expected date if you were to place a new order at the current time.

I don't understand your question exactly? What kind of notification do you want?