I'd very much like to be on a notification list for such a book, but I didn't see any obvious place to sign up for such an activity.
Did I miss something?
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You can sign up for our newsletter, and select the topics you're interested in receiving updates for here: http://post.oreilly.com/form/oreilly/... . In the "Product and Promotion Alerts" section there, you'll probably want to select "Macintosh" and whichever other checkboxes there that would pertain to Swift.
We do have a few other books on the subject, and a list of which can be found here:
I hope that helps!
Customer Service Rep,