Product Manager Matthew Izatt wrote on the Official Gmail Blog:
Two weeks ago, we introduced our Gmail app for iOS. Unfortunately it contained a bug which broke notifications and displayed an error message, so we removed it from the App Store. We’ve fixed the bug and notifications are now working, and the app is back in the App Store.
At the time of the original launch, the Gmail blog said the app, which can be used on iPhone, iPad and iPod touch, was optimized for speed, efficiency and touch.
According to The Huffington Post's Jason Gilbert, the app's most important new feature is speed: "It brings "push notifications" for Gmail to iDevices for the first time, meaning that you can now be notified the moment a new message hits the Gmail servers, just by glancing at the screen of your iPhone, iPad, or iPod touch."
The app is now available for download in the iTunes store.
Take a look at screenshots for the iPhone and iPad versions of the app.
GMAIL FOR IPHONE:
GMAIL FOR iPAD: