"For years, Valve has been all about writing software that provides great gameplay experiences," said the job posting. "Now we’re developing hardware to enhance those experiences, and you can be a key part of making that happen. Join our highly motivated team that’s doing hardware design, prototyping, testing, and production across a wide range of platforms. We’re not talking about me-too mice and gamepads here – help us invent whole new gaming experiences."One possibility is what Valve marketing director Doug Lombardi has talked about in the past. "We're prepping the Steam Big Picture Mode UI and getting ready to ship that, so we're building boxes to test that on. We're also doing a bunch of different experiments with biometric feedback and stuff like that, which we've talked about a fair amount. All of that is stuff that we're working on, but it's a long way from Valve shipping any sort of hardware."
Valve may have let slip they are working on hardware via a job posting for a hardware engineer. This is following the rumor that Valve is working on a Steam Box. The main role of the hardware engineer is to "work with the hardware team to conceive, design, evaluate, and produce new types of input, output, and platform hardware."