I sailed on the Sea Princess in Feb of '00 the Western Caribbean.
And just last month on the Ocean Princess Southern Explorer of Feb '01. We were surprised to see the exact same menu from 00 to 01. Though there was plenty to choose from I wondered how often the menu selection changes.
The Princess menus really don't change much. You may only see different (more) menus if you go on a longer cruise. Next time ask any Princess waiter who's been with the company for any substantial period of time and they can rattle off the 14 day cruise menu like the ABCs!