Congrats! We too were magically upgraded from a 4C to Concierge V back in August. You will need to purchase the 100 minute internet package for $40 and then the Cruise will refund it before you leave the ship.
Here are some of the other concierge perks we experienced on the Dream:
o has their own check in line and waiting area at Port Canaveral
o Ability to be the first group to board the ship
o rooms ready earlier. Ours was ready at 12:45
o luggage in room earlier. Ours was in the room around 1:15.
o Bathrobes and slippers for the adults
o Arcade Cards for the kids
o Bowl of fruit in our room on first day
o Refrigerator filled with H2O, coke, diet coke and sprite. We could get more up in the Lounge.
o Happy hour before each dinner seating.
o snacks throughout the day
o access to a concierge lounge on deck 12
o access to a private concierge deck on deck 13
o 16x20 lithograph.
o Private meet and greet with a Disney character on the "At Sea" day. This takes place on the concierge deck. The hosts don't know who it will be until the character shows up. Ours was Goofy.
o They have breakfast up in the lounge on disembarkation day till 8:45. We did this instead of showing up at Animator's Palette at 6:45am which was our assigned time.
o once you board you are taken up to the concierge lounge. The hosts present you with your itinerary, review it and are able to help book/change shore excursions. Reps for Palo/Remy, kids club and the Spa are there to assist you with new reservations/changes. This is better than having to go to 3 different areas of the ships.
o access to the cabanas. Even though on-line showed the cabanas were sold out, we were offered a Cabana for both days at Castaway Cay.
o Free 100 minutes of wi-fi (you need to purchase the $40 package and it will be refunded)
o Complimentary iPad rentals