The teasing of the new Big Picture mode that will put Steam
games on your television continues, as Valve officially announces the Windows beta will begin later today. They have launched this page
with details on what to expect from first-person browsing, daisy wheel typing, and more, which says a Mac beta is "coming soon" as well. Here's the announcement:
Valve announces a major update to the Steam gaming platform called Big Picture. Continue here to read the full story
Steam's new Big Picture mode lets gamers access all of their favorite Steam games on a television. With the press of a button, Steam displays a new full-screen user interface optimized for readability and interaction on TV. Big Picture has been designed to be used with a traditional game controller, while also fully supporting keyboard and mouse input.
Steam gamers can experience Big Picture by connecting their PC or Mac to a TV, typically with a single HDMI cable. Access to the complete Steam store is included, as is the Steam Community. In addition to their complete library of Steam games, each user's cloud files, Steam Workshop content, account information and preferences will be accessible automatically in the new mode.