Eugene posted on another thread that for guests onboard the voyager it is believed that the entire segment will be refunded.

I posted this additional information under his post.

There are also offers in writing to all those booked and boarding in Dubai. There are multiple choices from moving to the Mariner, to a full refund, to a compensation if accepting a contemplated revised itinerary and details of additional compensation if this itinerary should change again. They are also helping with any other costs such as air that may have been arranged. At this time all our passengers have decided to continue with their cruise.

Until they get to Dubai I think the situation is not that clear but they are taking all the steps necessary to advise passengers of all their alternatives. Sometimes in the end the passengers are very happy with the outcome of these events.