However - there is no guarantee you will be upgraded. It is the luck of the draw - and depends on what cabins have not been booked and paid for - and I am guessing that they take into consideration how much you originally paid, how often you cruise with them, how many are in your party, etc.
Do not book an inside room hoping to get an OV or balcony. You would most likely be very disappointed.
Our group- three women, two of whom were repeat Carnival cruisers, were repeatedly told by the Carnival agent that we would probably be upgraded and we shouldn't book a more expensive cabin. We were never upgraded. However, a friend who decided at the last minute to go with us booked a cabin and got an immediate upgrade to an outside cabin. He paid about the same for his cabin as we did. We suspect that part of it depends on how much you spent on previous cruises and how well the agent you go through advocates for you. That's why we think it's better to go with a private travel agent than to book directly through Carnival.
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Our group- three women, two of whom were repeat Carnival cruisers, were repeatedly told by the Carnival agent that we would probably be upgraded and we shouldn't book a more expensive cabin. We were never upgraded. However, a friend who decided at the last minute to go with us booked a cabin and got an immediate upgrade to an outside cabin. He paid about the same for his cabin as we did. We suspect that part of it depends on how much you spent on previous cruises and how well the agent you go through advocates for you. That's why we think it's better to go with a private travel agent than to book directly through Carnival.