This was our expectation. So much so that we hardly paid attention to the subsequent assignment the next day. We do carry on only so there was no need to fill out any bag tags at the port.
Finished the formalities, boarded, and headed to our cabin. MUCH to our surprise we had been upgraded to the primo balcony cabin. Mid ships, high up, one floor from the pool and bar, quiet sundeck area just a few steps down the hall. I can only assume the previous assignee got upgraded to a suite at the last minute.
We often do late booking gtys. You just never know. Have patience, remain hopeful, and the very best of luck to you!
If you do not get upgraded it will still be a fabulous cruise.