Please see the following link....
There are usually email updates from Extreme's newsletters.
You can also check the Extreme portal at http://support.extremenetworks.com/ and click on the downloads tab.
Always visit your Extreme homepage regular for the latest news, downloads, updates, and articles.
The article below should help:
The link in the article leads you to a form to fill out where you can receive the updates via e-mail.
Hope this helps!
You can sign up for these notifications at http://www.extremenetworks.com/support/service-notification-form.