There are plenty of obstructed verandahs, and rooms to avoid if possible, but as of yet, there are no official SV rooms on the Dream. With the Magic/Wonder, it took time, and they downgraded the SV rooms based on customer complaints. There are a few potential hints on the virtual deck plan that show one obstructed verandah cabin as an oceanview cabin, and another obstructed verandah cabin as a 6C cabin (which doesn't exist yet as a category) but
DCL says that's an error (yet one they haven't fixed in months.)
The closest to a secret porthole I've found are the sideways facing 9A cabins on decks 6, 7 & 8 (rooms x008 and x506). These are 9A room which have the same extra large porthole of the Cat 8 rooms. They are the only Cat 9 rooms with large portholes, but the rest of the room isn't upgraded to Cat 8 fittings, so it's not a true reclassification. The 8A cabins on decks 5 & 6 also benefit from a second large porthole and a larger floorspace (but wonky bathrooms), but these rooms often sell at a premium (higher than some verandahs) so they aren't a bargain unless you are looking to get twice the space, or a mini-suite feel, without the suite price (and can live with the bathrooms).