I don't know if there's a way to subscribe for updates with the publisher, but if you use Twitter I'm on there as @jstanier and I give updates on how it's going. If you're not on Twitter then I can drop you an email.
I'd recommend setting up a mailing list and promoting it on your site. See the "stay in touch" section at https://dataintensive.net/ or the "sign up for newsletter" section on https://the-cloud-book.com/ for examples.
