I'm on the Christmas cruise on the Wonder that is scheduled to stop there (in December). I'm fully expecting that port stop to be changed, seeing as they've already said no cruises will allowed to stop there in December. But, we are now less than 3 weeks from the last date to cancel for no refund, and it's still showing up... Like others have experienced, I'm starting to get really annoyed with Disney's lack of communication.
But, it seems like there's no harm in booking excursions - either the port stop stays and you get the excursion you want, or they cancel the port stop, in which case they also cancel the port excursions.