We're going to some of those places in May on Celebrity. Today in the mail came a booklet with DETAILED and authorotative information on the questions you've asked.
Why not ask Princess if they will be supplying similar information for your cruise? I'm quite sure they will do this in a timely way. In the meantime, just be sure your passports will not expire until at least six months beyond the ending day of the cruise. Otherwise, get them renewed.
If your cruise is earlier than mid-May or so, you should call Princess now for definitive answers to your questions. Ask them why they haven't coughed up the details before now.