Facebook notification bar is not activated by default after installation. To enable it, tap the Opera icon in the bottom right corner and tap the gear icon to open Settings. Scroll to notifications and toggle the Notification bar for easy access to Facebook. If it's not already the case, Opera will ask for your Facebook credentials.
Opera also added a media control panel and a new one-hand friendly video player in this update, which you can download in the Google Play Store. No signup is required, just download the app from the store to test new features before they reach the public channel.