I'm giving Paizo many props for keeping us informed as to this situation.
I had preordered my books through Paizo as well, and I am extremely disappointed as to how Amazon is doing this. SIX orders in two days is ludicrous.
As long as I can at least download the PDFs without the site exploding at 9am I'll be content for now. Hopefully the physical books will be in my hands sooner than later.