It's about due, but until the publisher decides to update it, I don't get to update it. There are length issues: I'd like to spend another 100 pages covering 64-bit issues, but there's a hard limit of 600 pages on the book. I'd have to cut something else out, and that's a hard decision. When I get the call, I will definitely do an update, but when that happens, again, is not up to me.
