The New York Times has written up a large feature on Valve and its bizarre corporate structure. It offers a few hints about what Valve is working on, as well as some images of its rumored gaming goggles.
You can check out the full feature by clicking here, where you can learn about the authors first-hand experience with the goggles, as well as Valve's recent hiring practices which includes Greek economist Yanis Varoufakis, inventor Jeri Ellsworth, a British graffiti artist, and Leslie Redd, a former school administrator.
The more I learn about Valve, the more confused and amazed I become about what is happening at its offices. I highly recommend checking out the full feature.