Google+ has received a minor update to its user interface. The update brings to new features but it makes the appearance of the Google+ a little bit more sophisticated.
The icon will now carry the long shadow design similar to what we have seen with Newstand. The red Google+ banner is now brighter and bolder in color. The update also brings with it more polished looking menus and a simpler photos layout. There a whole more of other little minor tweaks.
This update is most probably one that is in preparation for the new Android L.
Source: Android Central