The iOS 27 system update will be rolled out in a few weeks, primarily addressing issues in the Messages app such as failed message sending, media file transfer blockages, and cross-device synchronization problems. Specific improvements include implementing automatic retry for failed messages, ensuring independent message sending without interference, and enhancing cross-device synchronization stability. Additionally, the update includes performance optimizations and bug fixes for apps like Safari, Mail, and Calendar. The complete list of features will be revealed after the official rollout.