Updated system to Android™ 9 Pie™
Brand new UI for Android Pie
Updated Android security patch to 2019.4
Do Not Disturb mode
You can now customize the time range in the new Do Not Disturb mode
New Gaming mode 3.0
Supported displaying text content of the heads up notifications
Added notification for 3rd party calls
Dialer now supports Google Duo
Supports Google Lens to provide you with powerful image recognition experience
General bug fixes and improvements
Can't give you the link, but it's up in Official Oneplus Support forums, feel free to add it here!
Finally out boys, its already on the Oxygen updater app if you choose full download.