Yep, that is really unfortunate for those passengers. They were expecting a nice vacation, and instead, this happens.
Luckily, cruise ships are familiar with measures to control norovirus spread, since it affects cruise ships so often. Many of those same measures will be effective against this coronavirus.
Possibly, on the food handling side. But, I'm a bit concerned about the air handling problem. If you're next door to someone coughing out virus laden droplets, how sterile is your air supply? If you're in Yokohama with a balcony suite, you can open the door; but if you're in a lower-cost cabin with a fixed window, or more depressing, an interior room, you're at the mercy of the HVAC.