Answer from support today:

I was happy to check the delivery status again. According to the information stored, the delivery date is being clarified with the supplier and should be updated. As soon as the supplier can give us a delivery date, the status will be adjusted and you will be notified by e-mail. However, we are currently unable to give an exact delivery date forecast. At this point I can only ask for your patience and understanding. I hope that the desired item will be available soon.