Sounds like we're switching Microsoft TV: IPTV Edition to Mediaroom. Microsoft TV is something of a less strong brand so I think this is going to be a good sign of coming changes and a major release.
More details can be found in the Seattle PI article.
I wonder if this release will have anything to do with the rumored IPTV for Xbox. Hopefully we'll have this available in King county soon so I check this out more closely. I'll be keeping an eye out for more details 🙂