Surprising news indeed. I too wonder how Norwegian will come up with the money, the purchasing price is reported to be approx. 100 Million EUR.
Bad news for *A, SAS and customers in Norway, as many of the small airports in Norway will probably be loosing their access to the SAS and *A network and vice versa. This might not be a huge deal for most commuters that use Wideroe, but it's still unfortunate for those that are affected as it presents a small step back with regards to global connectivity.