I think it was one of two things, not counting pretty strange.

Either they are trying something new with that cruise, because it's a trans atlantic they figure it may be a different type of person than a regular cruise, and they are seeing if it drives people to higher priced cabins.

or

They had a huge amount of cabins blocked off for some reason (could be something as simple as new carpeting or it could be a massive block of people) and they don't know until close to sailing time what will and won't be available to give out.

It's highly unusual for a cruise line to totally blank out an entire section of cabins like they did here. There are many people who won't sail with a Guaranty cabin, so I don't get the reason for it either.

And before more people define what a Guaranty is, I fully understand what it is, just don't understand why every cabin on this trip is blocked out while the others dates have cabins to choose from.