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| New features added to the ribbon menu |
As you can see from the screenshot above (taken from Learn More - Mobile), "Find People" has been changed to "People", for consistency with the recently redesigned web version of Google+.
"Location" is a brand new button on the ribbon menu, and it could be a replacement for Google's Latitude feature or an updated check-in system.
Google+ Messenger has been purged from the app and Hangouts has took its place. Pressing the button from the ribbon menu will most likely take you directly to the Hangouts app. You can install hangouts from Google Play here or from the App Store here if you haven't already.
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| A brand new photo view |
The image above was took from this page on Learn More and reveals a brand new photo view, with new features such as Auto Awesome. In the upcoming update, you will be able to +1, view people tagged in the photo and jump straight into the comments via overlay buttons in the mobile photo lightbox. I don't know what the button on the top-right does from looking at the image, but it is possibly a toggle for turning the photo enhancing feature on and off.
Nothing else is revealed in the text on the help mini-site but all should be revealed later on as +Vic Gundotra has indicated on a post that he can't sleep.
Source and images: Learn More - Mobile