Hi Monty,
I'm another suffering from brochure withdrawal. So far have only booked the new Belize, Guatemala trip for next Feb, which was in the May brochure and I booked when it came out. I like a lot of the new tours which seem to have come out since, and those from the May brochure, but was waiting for the usual comprehensive September full brochure before booking more trips. So now waiting for the December mailing. Think you may be missing some early bookings by doing this. But there may be some other JY reasons for doing this, ?lots more new tours ready to promote in the December brochure (I know you have said that there are some more Burma dates to add - a trip I'm really keen to do).
However, having said all that I will probably be booking the Iceland trip for March in the next couple of weeks - its a trip that everyone seems to like from all the reviews so I've pretty much decided to give it a go.
Katy