I know I already said it dozens of pages ago, but just to stress the point: something I'm very curious about is how much this SteamOS could be a viable option even for a standard desktop use.
I mean, is its whole interface going to be in "Big Picture" style or there will be settings to make it suited for traditional desktop work?
What we know is that it is based on Ubuntu, but we don't know how much different it is. Best case scenario, you will be able to run pretty much all linux software on it.