Called my Carnival rep yesterday she told me our cruise is only 1/3 full. All of 4A is booked with only a Guarantee left available for that level all the rest of the levels are showing 9-10 cabins available which probably means there is more than that. She said its about a 70% chance of an upgrade right now the way it looks. Sail date is 5 weeks away. Do a lot of people wait until the last minute to book a cruise?