The first thing you’ll probably notice is the colored action bar and circular button for new content. These are both elements we’ve seen in recent Gmail and Calendar leaks, where the new content button is just a plus symbol. The other notable feature is a red overlay in place of the current gray overlay. The new post interface also appears to float now, rather than going to a separate page inside the app. Via link
A leaked on the Google+ redesign from a verified Google+ user. Seems like Google is putting a strong emphasis on design for its product. It is also likely we may will be looking at a design focus Google I/O this time round.