So it appears the official HTC Ev car dock is in the wild, the initial review does not seem impressive. I'll wait to hold judgment.
http://www.goodandevo.net/2010/08/official-htc-evo-car-dock-finally-in-stock.html#more
http://www.goodandevo.net/2010/08/official-htc-evo-car-dock-finally-in-stock.html#more