One of the coolest features about Google+ is its ability to automatically upload all the photos you take and then allow you to selectively share them at your convenience. While Facebook has been testing this same type of feature with a few users since August, the service is now rolling out publicly to everyone. As long as you have the most recent version of the Android app, you should be able to enable it soon.
It's a little unclear how long the rollout will take, but the feature should be seeing much wider availability. It won't be automatically enabled, though, don't worry.