The dock made its debut a couple hours ago, and the pricetag was about $10 cheaper than most retailers that have been offering the dock. It was complete with microUSB and audio out ports, but no video out, because the Nexus 7 doesn't support that. It charges through the POGO pin connectors. And, the Nexus 7 could play music while docked.
No word on when the dock may come back in stock, but we'll let you know when it does.
source: Google Play