Nintendo TVii is now available for the Wii U. Announced in September and suffering a minor delay last month, TVii is Nintendo's latest effort to pry control of the living room away from Microsoft and Sony, whose respective consoles have become the centralized entertainment hub for millions of consumers. In many ways, Nintendo TVii seeks to succeed where Logitech's Revue with Google TV failed — unifying streaming and broadcast video services into one cohesive user experience with relevant web-derived data and social media built-in. With game support slowly ramping up, could TVii be the Wii U's unexpected "killer app?" We go hands-on to find out.