Photo Booth: the app has returned with a Yosemite-style new icon.
Screen Sharing: now at version 6.0, Screen Sharing allows you to block others from sharing their screen with you.
Time Machine: say good-bye to the stars background because Apple has revamped Time Machine’s interface for translucent appearance.
Various tidbits:Handoff works between iOS 8 and Yosemite and is more functional though still not fully baked; AirDrop between iOS and Yosemite no longer requires having a Finder window open to receive a file; a new prompt to enable FileVault storage encryption appears on reboot.
来自http://www.idownloadblog.com/2014/06/17/ios-8-beat-2-is-out/