Changelog?
Comming soon. The version 17.6 is at the moment not available for new installs, only for an update from the previous version. That’s the reason why we were waiting with changelog. Martin Svoboda is typing… 
Hi all,
What’s new in business AV 17.6:
- Improved Anti-Phishing prevents you from falling victim to scams and fake sites (no browser extension needed!)
- We now recommend scanning for hidden network threats when you first connect to a new network
- Our systray icon now shows when you have a security notification
- Improved threat detections are now more visible and more informative about threats
Related thread on about this version on consumer space https://forum.avast.com/index.php?topic=208020.0