I suggest you go to cruise critic and then go to the Roll Call section where you will be able to meet up with several travellers who will be joining you on this cruise. You will have to log in.
Try cruise critic ship reviews princess lines they have photos videos etc you have a excellent captain in nick bates ex captain qe.
Beautiful ship, Captain is great, itinerary fantastic and I'm sure you make friends. They have singles get togethers which are good to get to know people and sit on a big table at dinner to get chatting with other cruisers.