Microsoft has just released a preview of a web service to help (and improve?) customer experiences with managing Office 365 Services IP address upgrades.
You already well know the recommendations/requirements/best practices in term of accessing Office 365 Services as well as the public website listing (and providing RSS feed and XML/PAC files) here http://aka.ms/o365ip.
Now, you should start using this web service (as it will eventually replace the website mentioned above).
You can access all the available documentation from here https://support.office.com/en-us/article/managing-office-365-endpoints-99cab9d4-ef59-4207-9f2b-3728eb46bf9a#ID0EADAAA=4._Web_service&ID0EACAAA=4._Web_service
In addition, the endpoints publication comes with an additional information to identify action to be taken
Benefits for administrators from using this web service and the new categories include:
As final reminder, please also review the Office 365 network principles to ensure you are always up to date https://support.office.com/en-us/article/office-365-network-connectivity-principles-76e7f232-917a-4b13-8fe2-4f8dbccfe041
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