The Scandinavian operation will be of interest to IAG as that is one hole in their network as a whole, I would have thought that would remain branded as Norwegian. Anything else, who knows?!
As racedo says, a buyout is dependant upon Bjorn and the Norwegians - and as they have said there have been no discussed yet, its going to be a while before we hear anything. In the meantime, you could of course see some other airlines/airline groups also take an interest!