Indeed, I am perplexed about that, as he talked about it less than a week ago.
I wonder if (t)he decided it's best to approach the problem only from a software point of view (Steam for Linux, Big Picture Mode) as there are plenty of companies that are ready to ship HW solutions and perhaps its best to let them figure everything out.
But isn't that what they were doing? I mean, they said they would sell hardware if they HAD to, but it's not their main focus. What they're more focused on making themselves it seems is input devices.