I think i have received the same letter. Putting it in to google translate it basicly sais that they have change our acount numbers and that we do not need to do anything as any direct debits etc will be updated accordingly. finally it says you can go online and cancel any paper corresponence and recieve it digitally instead.
This said i dont know if this will effect our bank card?
please dont take this translate as gospel, if anyone can tell me different i would be pleased to know