What is the pinout for HTC One X docks?
According to this forum the pinout is as as follows:


  It's the micro USB pinout in pogo form..
  1. 5vcc
  2. Data -
  3. Data +
  4. Audio out mono
  5. Ground. 
  
  Left to right pinout with the camera facing your left shoulder.


Regarding the car dock option I could not find any information.