Apple's WWDC 2017 introduced significant updates including iOS 11 with features like iMessages in iCloud, person-to-person payments via Apple Pay, and a Do Not Disturb while driving mode. The MacOS High Sierra was announced, enhancing performance and VR development capabilities, while the Apple Watch OS 4 introduced new watch faces and machine learning for personalized content. The event focused on making iOS more iPad-centric and fostering developer engagement through augmented reality tools.