https://www.techradar.com/news/ios-12

Apple's iOS 12 update for your existing iPhone and iPad will be announced today at 10am PT at the company's WWDC 2018 keynote. We're here reporting on it live.

You'll be able to test it early, too, as there will likely be three iOS 12 release dates: one for developers, one for beta testers, and one final version for everyone else.