Some time ago Microsoft announced that Yammer integration will ultimately replace the news feed section in SharePoint. (If you haven't seen Yammer think Facebook for the office) Before this can happen the Yammer service needs to authenticate with your Office 365 credentials, or the user ends up having to sign in every time they click the Yammer tab. Today I discovered that Yammer publishes their progress on features like this on a release page found here.
They did promise single login integration with Office 365 feature in the fall, but obviously missed that deadline. They are however claiming 80% complete, so hopefully we'll see this soon.