About a month ago, I booked a pair of rooms at AKL (I have a family of 6, with DMIL coming as well). I would definitely say book whatever you can as soon as you can, to help guarantee getting exactly what you want.
From the "sneak peek" at pricing that we got when the system was partially showing info yesterday, I saw that the price range at AKL went from 215-460 in 2007 to 225-540 in 2008. At the low end, that's a modest 5% increase, at the high end it's 17%. Since we're talking about summer season (value season when you're talking about a deluxe), you'll probably be closer to the lower end of that scale. What isn't certain is if there will be a weekend premium; if so, that helps to explain the huge price increase at the top of the range, but at the same time, also suggests that the weekend rates aren't going to be all that much higher.
With all of my planning thus far, budget-wise, I have a big spreadsheet made out, listing all of the components of my trip (air, hotel, tickets, ddr, any special tickets like P&P that I'm hoping will be relevant, etc), and I've just been assuming 2007 rates + 10%, and filling in more accurate details as I get wind of them (eg. DDR)
Good luck!