Apple has released both OS X 10.11.4 and iOS 9.3 as public betas:

Apple Releases First OS X 10.11.4 El Capitan Beta to Public Beta Testers
Apple Seeds First iOS 9.3 Beta to Public Beta Testers

Apple Releases First OS X 10.11.4 El Capitan Beta to Public Beta Testers

Apple today seeded the first beta of an upcoming OS X 10.11.4 beta to public beta testers, just a few days after releasing the first OS X 10.11.4 beta to developers and more than a month after releasing OS X 10.11.2.

The new beta is available through the Software Update mechanism in the Mac App Store for those who are enrolled in Apple's beta testing program. Those wishing to join the program can sign up on Apple's beta testing website.

Read full article @ MacRumors

Apple Seeds First iOS 9.3 Beta to Public Beta Testers

Apple today released the first beta of an upcoming iOS 9.3 update for public beta testers, just a few days after seeding the iOS 9.3 beta to developers. iOS 9.3 is available to public beta testers alongside iOS 9.2.1, a minor update that is also in testing.

Beta testers who have signed up for Apple's beta testing program will receive the iOS 9.3 update over-the-air after installing the proper certificate on their iOS device.

Read full article @ MacRumors