It's not often that what will be done during dry dock is publicized beforehand. I'm fairly certain that DCL doesn't really know exactly what changes (if any) will be done during the next dry dock, as it may be dependent on the Panama Canal readiness. I sure they have a wish list as to what they'd like to do, but it may turn out to be a "normal" dry dock - general maintenance, painting, new carpets, replacing damaged furniture.
One thing I'm certain about - they won't be adding the virtual portholes. They didn't add them to the Magic during her major re-imagining (something about having to replace/rewire all the electrical). Many of the interior rooms on the Dream class ships are in the same rough area on the ship, making it easier to contain that wiring to a smaller area. The interior rooms on the Magic class ships are all over the ship.