If you look on the RC website, at the deck plans for the Wonder, you will be able to see if you have connecting cabins. (you didn't check when you booked?)
If you mean: Can the balcony dividers be opened? The answer is usually "yes".
By the time you check in and get on board, unless there are delays, it will probably be just before or just about 1 P.M. That is the time that cabins are generally available.
Mountains of luggage? Aren't you planning on giving most of it to the porters outside?
If you need a bottle warmer, bring your own.
There will be a refrigerator in your cabin. Reports are that Wonder's are cold, so you should be fine. (on some ships, they are barely lower than room temperature.)