Proper structure for internal product release notes

Hi Team-

I am trying to figure out what would be the best way to communicate internal product release notes to the users. 

Here is the general overview;

• We have like 5 internal products 
• Each user/department utilizes one or more of the products - Some user use all and some don't use any
• Each user in the entire company would be able to view the release notes
• Users who want should be able to "subscribe" to receive an email notification when a new release note is published
• Additionally, the portal would be utilized to publish training and usage docs for the specific product (won't be strictly release notes only)
• Users who do not opt-in to receive email notifications should still see the release notes when they open the home page of the intranet.