The Gmail app on iOS was updated today to include support for the following:
- Notification center integration
- Sending emails through alternate email addresses

Editions included: 
Google Apps, Google Apps for Business, Government and Education

For more information:
http://gmailblog.blogspot.com/2012/06/notification-center-support-for-gmail.html
http://support.google.com/mail/bin/topic.py?hl=en&topic=1205739&parent=21369&ctx=topic

whatsnew.googleapps.com
Get these product update alerts by email
Subscribe to the RSS feed of these updates