Hot on the heels of the latest developer beta, Apple has released a new version of the OS X El Capitan Public Beta as well. Members of the Apple Beta Software Program can download the new release through the Updates section on the Mac App Store.
Remember that though this is a public beta, it isn't completely open. If you're interested in participating, you'll have to sign up at the Apple Beta Software Program website to get started. The public version of OS X 10.11 El Capitan is expected to this fall with improvements to Safari, Spotlight search, and the debut of Apple's Metal graphics framework on the Mac platform.
If you're interested in the OS X El Capitan public beta, hit up the link below for everything you need to know.