Shortly after letting the 10.8.1 Mountain Lion out of the bag, Cupertino's now released the next dotted version of its feline OS X to members of the developer community. According to the seed note, this early release will be focusing on a slew of social areas as well as other handy applications, including Facebook, Messages, Game Center, Reminders and, of course, the company's own web browser, Safari. As is usually the case with these young builds, Apple suggests you install it on a machine "you are prepared to erase if necessary," though something tells us you were already well aware of that. But in case you do want to install v10.8.2, you'll find the rest of the deets at the Apple Developer site linked below.
Apple OS X Yosemite