I've tended not to preannounce products or take orders in advance. But all the "when will your D7000 book be ready" emails are making me nervous.
Let me explain: I use just-in-time production for my works. If sales outstrip what I've produced, it typically takes about two weeks for me to get new materials to fill those orders. With existing products, I try to keep one or two weeks of extra product around, just in case there's a bump in orders, and I can look at order history and come up with a reasonable production schedule that keeps them at the ready.
With a new product that's potentially in hot demand, if I incorrectly assess demand I can get into a situation where it's difficult to catch up (a problem that Nikon has had recently, and I don't wish to repeat). So: when I publish my D7000 review, probably later this week, I'll be opening up the order process for the Complete Guide to the Nikon D7000. But the book itself will not ship until January 19th (assuming nothing gets messed up in the production).
Yes, that means the book is written, though I'm still doing some last minute proofing and fine tuning before putting it into production.