The future groom already has said that he doesn't want to become a Swedish citizen.
(He keeps his US & UK citizenship).
Chris O'Neill won't get any titles.
Will they break tradition?
Much has been written about Royal Marriages.
The most important questions always are:
How will the dress look like?
Who will be the designer?
Well there are rumours that Princess Madeleine will choose an Italian designer:
Valentino has made the Wedding Dress of Queen Máxima of The Netherlands (Then princess).
A Valentino Wedding Dress - Source Wikipedia
A Valentino Dress made for Audrey Hepburn. - Source picture: Wikipedia
Princess Madeleine can choose for a Swedish Designer ....