Apple Seeds Second OS X 10.11 El Capitan Beta to Developers
Apple today released the second beta of OS X 10.11 El Capitan to developers for testing purposes, just over two weeks after unveiling the new operating system at its 2015 Worldwide Developers Conference. Any new changes found in the second El Capitan beta will be detailed below.
The update, build 15A204h, is available through the software update mechanism in the Mac App Store and through the Apple Developer Center. Apple has also released OS X Server 5.0 beta 2.

OS X El Capitan largely builds on the features introduced with OS X Yosemite, focusing on improving performance and user experience. Behind-the-scenes improvements in El Capitan have made a number of apps and processes on the Mac much faster, and the introduction of Metal makes system-level graphics rendering 40 percent more efficient.
Along with a new systemwide font, El Capitan includes a revamped Mission Control feature, a new Split View feature for using two full-screen apps at once, deeper functionality for Spotlight, and several new features for Safari, including Pinned Sites for housing frequently-visited websites and a universal mute button that quiets all tabs.
Mail's been updated with new iOS-style gestures and Smart Suggestions, and Photos, Notes, and Maps have also gained small improvements.
OS X 10.11 El Capitan is currently only available to registered developers, but Apple plans to offer a public beta of the software in July. Following testing, El Capitan will see a final release in the fall of 2015.
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Top Rated Comments
[SPOILER="1024x1024 verson"]
I have 5K iMac and I can say it is a huge improvement from Yosemite.
I don't get the shock and indignation. You should not be running beta software on your production system. Beta software is for testing in a VM, or another computer. Why would you install a beta operating system if you're actively working on an application that will be released in the next two weeks? That's very dangerous.
Yes, these are previews are for devs. They are for devs to get their apps working with the latest SDKs and operating systems so that they are ready WHEN the new versions of the operating systems are out of beta and released to the public. They are not there to continue working on applications that you're planning to release before the next operating system is released. This is not rocket science to understand.