Henri M. said:
We only know this news from a royalty-watcher in the daily program Boulevard (Peter van der Vorst). There are already people speculating on diademes, but there is no any confirmation at all... so, let us not become too overenthusiastic.
But Peter van der Vorst has strong cards to play on these six, because the three couples have a link with the Norwegian royal family:
HRH The Prince of Orange
HRH Princess Máxima
Princess Máxima is a godmother to Prince Sverre Magnus
HRH Prince Friso
HRH Princess Mabel
The King of Norway is a godfather to Prince Friso
HRH Prince Constantijn
HRH Princess Laurentien
Princess Laurentien is a godmother to Princess Ingrid Alexandra of Norway
If (if...) all these six go to Norway indeed, I expect Queen Beatrix to join the party as well. I can not imagine her remaining in The Hague while the gotha assembles together.