There is a roll call on the other princess website - don't think I am allowed to say but if you google it roll calls sea princess there is an active roll call there. Hope this doesn't get taken off! Have a good cruise we have made lots of friends using the roll calls best wishes.
Even if there were others going on the cruise this website will not publish personal information, so I am afraid you will just have to wait and see when you join the ship. Enjoy your cruise I am sure you will meet quite a few people some of whom you might well end up keeping in touch with.