Before the update, users could receive notifications when new mail was received, but opening the app was required to download the messages.
The app also supports a simplified sign-in that allows users to sign into all Google apps when signing into a single app such as Maps, Drive, Chrome, or Gmail.
Background app refresh: Gmail now fetches your mail even when it is not open so it will be waiting for you when you open the app. Requires iOS 7 and at least one type of notification (badge, alert, or banner) to be turned on.Gmail can be downloaded from the App Store for free. [Direct Link]
Simplified sign-in: Signing into Google Apps such as Gmail, Maps, Drive and Chrome just got easier. Sign in to one, and you'll be signed in to all automatically.
Note: In some cases, you may need to sign-in to Gmail again after this update.