On Wednesday during Valve's Steam Dev Days Conference in Seattle, Valve's Anna Sweet said that Valve plans to introduce movies, TV and music to SteamOS. We already knew this based on the SteamOS description, but she indicated that media would need to be in place before Valve launches the official final version to consumers later this year.
"We're working with many of the media services you know and love. Soon we will begin bringing them online, allowing you to access your favorite music and video with Steam and SteamOS," reads the SteamOS description.
An early beta of Valve's Linux-based SteamOS was made available for free in December 2013. Based on several hands-on reports, Valve's platform isn't meant to replace a computer's operating system, but to serve up Linux-based games in the living room instead. So far both SteamOS and the Steam desktop client do not provide movies, TV shows and music.
Also stemming from Valve's Steam Dev Days Conference is additional information regarding the controller's evolution. Tweets from the convention reveal that Valve has ditched the touch screen in favor of a d-pad and standard controller buttons. A summary of Day 1 can be seen here, and reports that biometrics are important, but the hands are not the best place to capture them.
The summary, based on tweets throughout the day, also reveals that the retail controller will require two AA batteries (both rechargeable and non). The Steam Controller API supports up to 16 controllers at once, and Valve is keeping VR in mind while designing this controller. Remember that Steam Machines will not ship until this controller (along with Steam OS) is complete and ready for consumer use.
That said, the Day 1 summary points out that more changes are coming to the controller, as Valve just started processing the beta feedback, so stay tuned in that department.