In somewhat surprising news Google released the developer version of Android N well before Google I/O which is scheduled to May. In addition to releasing Android N, Google allows people to registers as developers and get 25% off on the Pixel C so you can test your apps.
You can get instructions how to dowload Android N for a supported device here.
You can Register for your Developer 25% discount here.
You can buy the Pixel C here.
With the discount you can get a Pixel C with keyboard for around $540 depending on taxes. Previously the same combination would have cost you almost $700.