This is almost a non-annoucement. They've basically said they were doing this for the last year. The only news is a sign up process for early steam boxes.
No, it emphatically does not mean that. In fact, this announcement makes it sound even more like they are going to abandon it. As far as I can gather from this announcement, they're releasing a very small number of units for beta testing, and then they're getting out of the hardware game and letting third parties carry the torch.