With basically zero warning, Google has released Android N previews for the Nexus 5X, the Nexus 6, the Nexus 6P, the Nexus 9, the Nexus Player, and the Pixel C. It can be installed by flashing the OS onto the device, or by joining the Android Beta Program. Personally, I'd recommend joining the program, because then updates are pushed over-the-air. Be sure to back up your personal data, too. Almost every method of installing or removing the preview build will intentionally wipe the device. (Technically, installing from the Android Beta Program shouldn't erase user data, but errors can occur, and, even then, the device will be wiped when you leave.)
Aligning with this announcement is a discount on the Pixel C. It is only available to developers, and only within the US. Also, before I found out that Canadians were not eligible, I tried getting a code and the website seems to silently fail. It basically just refreshes and no email is sent, so Google might have pulled the plug once non-developers heard the news. Android Police believes that it only applies to the 64GB version, but Google's announcement wasn't clear on that. This would make the Pixel C available for $450 USD, which is quite cheap for a 10-inch, Tegra X1 device.
Android N will have a few user experience (UX) changes. The two most obvious ones are app splitscreen, which behaves like Windows 8's Windows Store app snapping, and “direct reply notifications,” which allows, for instance, replying to a chat message from the notification itself. Google has also moved to OpenJDK, as we mentioned during the holidays. This is an Oracle-approved, open-source implementation of Java that can be freely used.