We did used to have a dedicated newsletter for the Dorico blog, but in the great GDPR-ocalypse of a few years ago, I was forced kindly asked to shut it down, and unfortunately it’s not really practical for our digital marketing team to send newsletters out every time we update the blog.
On the subject of giving away your email address to another service, there are good email privacy tools available these days. If you use Gmail, you can add a suffix to your email address when you sign up to a new service, allowing you to easily filter out any emails sent to that particular address. Other email providers (like my provider of choice, Fastmail) offer similar features.
There are also desktop apps you can use to keep an eye on blogs like the Dorico blog and notify you when new content is posted. On my Mac, I use one called FeedNotifier for this purpose.
Finally, a forthcoming update to Dorico itself will show a little badge on the Learn button in the Hub window when new content has appeared on the YouTube channel or on the blog since the last time you visited the Learn page, to give you a hint to click on that button and check out the latest news.