Yes, he did. He just didn't give any specifics--yet. We now know that this blog is the forum by which they'll provide details about the progress of Windows and receive feedback from the public.
For the Windows team, this blog is an important part of developing Windows 8, as was our blog for Windows 7. Blogging allows us to have a two-way dialog with you about design choices, real-world data and usage, and new opportunities that are part of Windows 8. Together, we will start the unique adventure of bringing a major product to market. We're genuinely excited to talk about the development of Windows 8 and to engage thoughtfully with the community of passionate end-users, developers, and information professionals.
IOW, "save this space" and stop whining on C9 or the Silverlight forums.