Apple today seeded the third beta of an upcoming OS X El Capitan update to developers and public beta testers for testing purposes



From MacRumors:

The new beta, build 15B30a, is available through the Software Update mechanism in the Mac App Store and through the Apple Developer Center. The first beta of OS X 10.11.1 introduced support for a range of new emoji included in Unicode 8, like cheese wedge, taco, burrito, popcorn, middle finger, unicorn head, and more. Other betas appear to include under-the-hood fixes that are not immediately apparent.

  Apple Seeds Third OS X El Capitan 10.11.1 Beta to Developers and Public Beta Testers