There were some new ATP features being released. For instance there is new reporting capabilities, better performance with lower latency for emails/attachments that are being scanned, deeper URL detonation, and intelligence sharing with Windows Defender.
However, what got be excited is that ATP is being extended beyond Exchange Online. ATP will now include protection for SharePoint Online, OneDrive for Business, Word, Excel and PowerPoint. I found this to be really exciting.
New ATP Features Coming - https://blogs.office.com/2016/09/26/applying-intelligence-to-security-and-compliance-in-office-365/