In a detailed post to Google+ this morning, Googler Virgil Dobjanschi announced new and enhanced features for the Google+ Android app. They'll be arriving in an update to version 4.1, set to go live today. According to Dobjanschi, the changes are focused on additions and revisions suggested by end users, and looking at the list, we're inclined to believe him.
First of all: no more Google+ Messenger. Ha-lay-freakin-lujah. Since the new Hangouts app has effectively replaced G+ messenger on the web, the mobile version is following suit, meaning you won't ever have to see that extraneous icon in your app drawer again.