If you are talking about February 2008, then my guess is that the schedules will not be finalised. The only folks that will know are VS.
If they have reduced the rotations by one a week, then they will have a thumping good reason for doing so and that will relate to insufficient loads on a particualr day of the week. Not just once but across the whole season.
If you want to book now - then you can only go with what they are offering!