Update: It appears the widget for Google+ has disappeared in this update, and images now appear somewhat compressed and pixelated.
It's unclear if this is intentional (It seems one of the app's developers has said the widget will return soon, over on Google+.)
The Google+ app team just dropped a surprisingly massive update onto the Market, and it brings changes galore. In fact, there's so many changes that they've called it a "completely new app." Take a look:
The UI has taken a turn towards the styling we've seen in Ice Cream Sandwich, and menus have been reworked to resemble the next version of Android as well.