Yesterday the Bluetooth desktop dock, today the Bluetooth car dock; FCC filings for Google Nexus One accessories are cropping up with increasing regularity. Described in the document as for the "Google Phone" - rather than the Nexus One, as the handset has always been referred to previously - the car dock looks, from the hastily slapped together diagram you can see after the cut, like a pretty straightforward in-car cradle.
The document - which was filed by HTC - doesn't list all of the car dock's functionality, but we're guessing it will both charge the Nexus One and allow for hands-free speakerphone use too. It'll also possibly allow for wireless streaming of media to compatible Bluetooth in-car head units, though that's all just speculation.
The Nexus One is expected to arrive early in the new year, both sold directly from Google and - eventually - via carriers such as T-Mobile in the US. Both Google and carriers are believed to be planning subsidies for the handset's hardware.