These are the rooms located in the turrets of the outer buildings. Basically it is a regular room and then extends out into the turret with an extra sofa/tv living area. So basically you are getting a little extra space. Most of them do have balconies that go off to one side, if that makes sense at all. Prior to the refurb they have only slept 4, because there is no day bed, but now I'm not sure if they've added a day bed or not.
Do a search and you might find someone who has pictures of what they look like.