Google chose October 31st, Halloween, to take the wraps off its new Nexus 5 smartphone and Android 4.4 KitKat, the latest version of its mobile operating system. Google's latest Android flagship phone starts at $349 off contract, and KitKat comes bundled with a litany of new features designed to appeal to high-end users, while furthering Android's growing reach in developing markets. But with so many powerful Android phones to choose from now, the extent of Nexus 5's success remains an open question.