Unless something is heavily damaged in the cabin, the only thing you can hope for is new carpet and a sofa. The only "updated" cabins are the new ones added during her Amp.
That may be in but in reality, I don't recall anyone ever reporting being seated ahead of someone else due to their C&A level (except maybe at P level)
You can pick any other ship in the app which is doing 3 and 4 day cruises and the menu will be similar. Also, set the app to the current sailing, not yours.