iOS 27 lists three changes to VoiceOver, Apple’s built-in screen reader: richer descriptions of images, Live Recognition, and Action button integration.
Apple’s published record for those three items runs to about a dozen words in total.
Apple’s iOS 27 wording is that those descriptions become richer, which points to more detail than a short label.
Live Recognition is a name without a description Live Recognition appears in Apple’s VoiceOver entry for iOS 27 and nowhere else that Apple has published.
Action button integration, and which iPhones have the button The third item ties VoiceOver to the Action button, the customizable button Apple confirms on iPhone 18 Pro and iPhone 18 Pro Max in its tech specs.