Two years after the "Jupiter" release, elementary OS 0.2 Luna (stable) has been made available for download recently. With a bit of a delay, here's a quick overview of what to expect from Luna, along with screenshots and of course, a video.
elementary OS 0.2 Luna stable
Based on Ubuntu 12.04 LTS, which will be supported until April 2017, elementary OS Luna ships with its own shell called Pantheon and applications that respect the elementary OS philosophy: beautiful, fast and minimalistic.
elementary OS Luna uses a window manager called Gala, based on libmutter, which comes with smooth animations along with a really cool workspace switcher (Super + s) and a beautiful Expose-like feature (Super + w):
rest here