This sounds like such a good idea, I'll definitely be getting us one! Seeing as we might not be going before October then I may as well leave it until then no? I'm assuming they won't be changing it again in the near future.
We don't go until September, but I have seen comments on other boards that there might be a finite number of these. Since we won't be back within the year, as we have 3 different holidays booked, we might as well get it now and make sure of it.