They come either through an RSS (Really Simple Syndication) feed or directly into your email box no commercials, no stupid pet tricks or celebrity sightings.
Apparently, the AV center is the mystery box on the shelf below the PDP in the picture above which will magically bundle the various signals from your tethered devices such as DVD, set-top box, etc. and then feed 'em up to the TV over 802.11a WiFi.
We've been told that the beta will start to roll out very slowly -- early adopters and journalists have been granted early access, but if you're signed up on the waiting list, you can expect to see a notification box at top of your News Feed over the next few weeks.