I'm not pro-Royal Family, and I think they should just be treated as a normal family without any constitutional significance.
Still, it was pretty sad to hear the news, and the best wishes to her family.
Having a King will be odd, and I think it could well strain the relationship with the Monarchy in the UK and Commonwealth. (A fun, side-fact, it is for Elizabeth II that we refer to the "Royal Family" and not the "Monarchy", which was the prior terminology. It does make them seem all the more approachable.)