First look: iOS 9 brings tons of tweaks to search, music, mail, and more

Mail

• The dialog that lets users add automatically-discovered contacts and calendar events has been redesigned to be smaller.

• Users can now add attachments to messages, the same way they insert photos.

Siri & Search

• Search can now...search...through documents and "Found in Mail" data, like new contacts.

• Users can now set a default Notes account for Siri in Settings → Notes.

Podcasts

• Podcasts can now send notifications.

• Unplayed podcasts now have their own section in the Podcasts app.

• More advanced and clearer options for downloading and refreshing podcast subscriptions within the Settings app.

Music

• Shake to Shuffle has been removed.

• There are far fewer settings for the Music app; users can change their album sort settings, adjust the EQ, set a volume limit, and initiate Sound Check.

• iTunes Match is now under the "iCloud Music Library" umbrella.

Miscellaneous

• Users can now choose whether the iPhone side switch acts as a mute switch or locks device rotation in Settings → General

• Users can now search through Settings using a bar at the top.

• Users can now configure the number of seconds to skip when skipping through audiobooks.

• Shake to Undo can be disabled in Settings → General → Accessibility.