Getting an email notification when a new Drush version is available With standard Drupal modules, you get an email notification when there's an updated version.

How can we have this option with Drush?

I searched the official http://drush.org website and unfortunately there's no mailing list or RSS feed so that we know when there's a new version of Drush out.
If you go to the Drush project page on Drupal.org then you can follow the "Releases" RSS feed found at the bottom of the page.

EDIT

You can also use the IFTTT.com service if you want the e-mails.  Just set up a rule on the site so that when the RSS feed gets updated, it sends you an e-mail.