Apple also released OS X Yosemite 10.10 Developer Preview 4 two weeks after Preview 3 alongside with the iOS 8 beta 4 Upgrade is recommended for all beta users. In addition to the release of Yosemite Recovery Update 1.0 utilities, which, according to the description includes enhancements OS X Recovery.
Supports for AirDrop work between OS X and iOS ; users can now share images and other data between mobile devices and desktop without a wire.
The first beta version of Yosemite was made available for download in the beginning of June. As you know, since April OS X beta program is open to everybody. Therefore, users who want to install Apple OS X on their Macs without the need of getting an account.
This Fall, the release of OS X Yosemite will be made available to the public and will be available only through the online store Mac App Store.