Because as of 6pm CDT, Apple's no longer accepting orders. Only the first generation is available on store.apple.com (all models in stock, natch), and there's a "notify me" option that'll send you an email when they're accepting pre-orders again, or it shows up in a nearby store. Edit: appears to be browser wierdness. But oddly, the page I was seeing was one I'd NEVER seen before, and I had been checking the backlog status several times a day for the past week, which had been working fine up until getting the new page at 6pm. Clearing cache had no effect, but restarting gave me the ordering page.