You can download the latest version of app directly on your device through the Google Play Store or by using the link which follows:
The update is being rolled out in stages, so it maybe awhile before it reaches your device. If you dont want to wait for the update to arrive you could consider downloading the latest APK using the following link
- Download Google+ 4.1.1 APK
The Auto Awesome feature happens in the background and there's no reliable way to activate it aside from taking similar photos that Google+ can recognize. The new notification feature is useful as it eliminates the need to constantly check check your online Google photos for the animated pictures.
source - +Virgil Dobjanschi | Android Police