Google developer Anish Acharya just announced the features of the new version of Google+ for Android. "New UI," I hear you shout; no. This update is strictly limited to features. The new version supports better hashtagging, richer snippets of web content, and better sharing of web content. This is revolutionary! Wait, no, that was yesterday.
For now you're going to have to stick with this design for the Google+ mobile app. You can grab the update from the Google Play Store now.