Google announced the pilot program on December 7, 2010, offering people interested in testing the netbook a number of different ways to sign up (e.g., a special page on YouTube, a page in Facebook, etc.).
It is a 12.1 inch netbook, unbranded, covered in a black, rubberized material. In addition to wifi, it also offers a free monthly allotment of 100 MB from Verizon Wireless. They offer full-sized keyboard, a customized trackpad, and up to eight hours of battery life, eight days of standby time, and boot up nearly instantly. They're also locked into ChromeOS, although there is a "jailbreak" switch, and some enterprising people have gotten it to boot other OSes.