Aft Wrap Balcony - Carnival Magic vs Dream

[socaldesign]

I know there are a lot of posts about aft wrap cabins. Hope you don't mind another couple of questions. We're booked on Carnival Magic 3/11/12 in aft wrap 7459. On the Magic interactive web site in the deck plan section it states:
Stateroom 7459 Premium Vista Balcony
Deck 7 Category 9C
Two twin beds (convert to king). Sofa and coffee table. Full
bathroom with shower. etc...

Other posters have stated in the equivalent cabin on the Dream there is no sofa. Since the ship has not launched, can Carnival actually give definitive descriptions of the cabins, or do they post generic descriptions and then change them later on? Are ALL balcony cabins really 185 sq ft or are the odd shaped cabins larger or smaller?

We've only been on one other cruise and that was almost 25 years ago - a not so great experience on the old Dawn Princess.

Thanks in advance for some insight.