Apple has released an Apple News Format Reference in the iOS Developer Library that provides developers with technical details on how to prepare for the upcoming release of Apple News Format, which allows news publishers to create customized layouts with iOS fonts, rich photo galleries, videos and animations optimized for iPhone and iPad.
Apple News Format will allow for all news publishers to have customized layouts with rich graphics and other content, rather than basic articles being pulled straight from an RSS feed, as initial selected partners have had since iOS 9 was released. Apple has shared a direct download of example articles as a guideline.
Apple has also released an Apple News API Reference that explains how publishers can use the Apple News API to integrate Apple News with their existing content management system to access a rich suite of tools for measuring user engagement with published content. Apple also updated its News Publishing Guide with new Delivering Content and Managing Content sections.
Apple News Format is still listed as "coming soon" on Apple's website.