OS X El Capitan is expected to be released to the public in the fall after the beta testing process is complete.
Apple today seeded the fifth beta of OS X El Capitan to public beta testers, two weeks after seeding the fourth beta and a month after providing the first OS X El Capitan beta to the public for testing purposes.
It is not clear what is included in the fifth public beta as Apple has not released a new seventh OS X El Capitan developer beta, breaking its pattern of seeding betas to developers ahead of public testers. Past betas have featured no outward-facing changes, so it’s likely this beta also focuses on internal performance improvements and bug fixes to get the operating system ready for its public launch.
Beta testers who have signed up for Apple’s beta testing program and already have the public beta installed can update through the Software Update mechanism in the Mac App Store.
source | www.macrumors.com