I booked on March 5, 2024, Daimond Princess, Singapore to Tokyo. Booked the cruise several months ago, only choice of booking was OG Guarantee.
So there is not always a choice. Princess site has the cruise as "Not Available" for the last few months. So I am thinking its totally booked. (unless large TA have booked blocks of rooms, which will end up bing released).
It will be interesting to see available after final payments.
Final payment is due in about 30 days, will be looking for ward to the bidding process.
See what happens.