The yellows on Amazon.de are not even from Amazon itself, but from a third-party Marketplace retailer. I think they don't they even have it actually in stock, but just want to draw the premium almost 800 € from you for this.
My advice would be to cancel it there and get it for the "normal" 599€ somewhere. The wait time should almost be the same.
Because from all what I read, they say they have some in stock still, but nobody who ordered the yellow one there in the last week had his/her order processed until now.