The Nexus 7 has always had four little gold connectors on the bottom left side of the device. Everyone knew they were for a dock but there was no dock to be seen when the device went on sale in July 2012. Six months later ASUS have at last announced the Nexus 7 dock. God knows what took them so long, but at least it's here now.
The dock should start shipping in the coming weeks through the ASUS online store and Google Play store. Other retailers may also stock the dock, including Amazon and Currys. We'll just have to wait and see.
The dock supports a mini USB port and a headphone jack on the back. Other than that the dock has no other features.
There was some confusion on the pricing of the dock. The Verge said it would be retailing for £79 in the UK which is completely absurd. Pocket-Lint then confirmed with ASUS that the price of the dock in the UK will be £24.99, a lot more reasonable. The pricing in the US for the dock will be $39.99.