The new feature is described on Apple's iOS 8 enterprise preview page, as delinking AirPlay from WiFi will make it far easier for people to use AirPlay in classrooms and businesses that may have complicated networks.
With iOS 8, you can wirelessly connect iPad, iPhone, or iPod touch to Apple TV without first connecting to the organization's network. Which means you can present or share your work even if you're offline or the organization has a complex network.With iOS 8, Apple will also make it easier to capture video from an iOS device directly on a Mac. As described by our sister site TouchArcade, an iOS 8 device plugged in to a Mac will show up as a camera, which can have its screen recorded in QuickTime. This feature is designed for developers to create app previews, but end users will also be able to use the function to record their device screens with iOS 8 and Yosemite.
Apple's new peer-to-peer AirPlay feature and the iOS 8/Yosemite video capturing capabilities will be available to the public this fall, following the official launch of iOS 8 and OS X Yosemite.