Apple has released the second public betas of macOS High Sierra and iOS 11 to public beta testers. The finished versions of the operating system updates are due this fall.
The new public beta of High Sierra enables Time Machine support and adds routines to AVKit for developers to allow users more flexibility for content playback when multiple outputs are available. The new public beta of iOS 11 includes a fix for Bluetooth connection issues using Wireless iAP protocol and brings back the "swipe up" gesture to close an app in the app switcher and Control Center view on an iPad.
If you're not already signed up for the public beta program, you can do so here. The public beta program is free, but remember: beta software is unfinished software so use with care.