It's going to be a Steam-Console, not an alternative main OS but a TV box Multimedia Console OS. I doubt it'll have much in the terms of actual office use but it's linux so people can make packages for it. But it's focus is being a console.
Also another interesting thing to consider: Streaming Construct 2 from PC to SteamOS Box. Do you think that SteamOS would support that kind of streaming?
FAQ says boxes will be easy to hack / mod / install stuff, etc