macOS 27 Beta Reworks Mail's Compose Window Around Siri AI

For macOS 27 Golden Gate, coming this fall, Apple appears to be testing a new formatting bar for the Mail app's compose window that promotes Apple Intelligence's Writing Tools and Siri AI, based on findings in the latest beta.
Feature flags discovered by MacRumors forum member "mactracker" – who this week also revealed the hidden Siri "voice pad" interface in beta 4 – show the reworked bar in Mail's message composer, which now features "Write with Siri" in the most prominent position