I just heard from my editor: she approved my book manuscript!
How this worked: I sent her the first draft, she made suggested edits, and I implemented (most of) them in the final draft. I sent the final draft to her last week, and yesterday she accepted these revisions. So, the final copy is in, she likes it, and it's already in production!
That doesn't mean the book'll be out in a week, though. It doesn't even mean it's done. I'll be getting copy edits back, and then I'll have to read the book carefully to make sure the edits are good. Since this is a science book with some cutting edge ideas in it, it also means I have to make sure that what I wrote is still accurate. Then I'll send it back with corrections (if any), and they'll lay it out in book form. I get that copy, check it again, and then if it's good, then everything is good.
We're still looking at an October release, but I'm hoping it'll be sooner. We'll see.