Apple annually releases its initial beta software for Mac and iOS at WWDC. Today, Apple announced iOS 10 and the the newly renamed macOS Sierra. These new versions of both macOS and iOS are available to download now via the developer portal. To download the developer preview for iOS 10 beta 1 or the developer preview for macOS 10.12 beta 1 go to beta.apple.com and log in with your Apple ID. Remember, in order to download the developer's preview today you'll need to have a developer account which costs $99/ year. Otherwise, you can wait until the Public Beta comes out in July...
Source: http://www.gsmarena.com/ios_10_beta_1_and_macos_sierra_beta_1_now_available_to_download_for_developers-news-18807.php
