I wish I saw this post much earlier, like on Nov 17th. Most of the Aqua Class cabins (A1) have been booked. There is a roll call on the Jan 31 2020 sailing and it's already 4 pages long.
Thank you for the heads up. I called Celebrity to book within minutes of reading your post :) We did book the 12 NT on April 5, 2020 a year ago and didn't think to check other sailing/dates.