Sarah 69 was promoting the cruise for a few hours everyday while we were there (lovely to see her!) and said they're offering good discounts if you book now. I'm not sure why members would get extra discounts.
We just booked it. 9th deck seems to have a lot of activity and on one of the FB pages there is a room list being put together so we can find each other. Chinos said yesterday that over 300 cabins booked as of last night. We've never been on a cruise but this might be a great way to experience it. Can't wait!