Google has updated their mobile app for the Google+ platform.
Apps for both iOS and Android devices have been updated.
Changelog:
Android
- Teens can now create and join Hangouts from mobile
- Join Hangouts on Air from mobile
- Floating timestamp in photos view
- Shortcuts for post creation
- Ability to report abuse in Events
iOS
✓ Full iPad support
✓ New feature: Google+ Events
✓ Attach Instant Upload photos to posts
✓ Start and join hangouts
Source:
http://techwhack.com/google-mobile-app-hangouts-air-support-android-coming-ios-4318/