It's a single wire that connects to the FoC terminal of the Obsidian Board.
This is true. All Obsidians are FoC compatible. The extra money for the FoC really goes towards the upgraded 10W LEDEngin.
If you solder a wire to the pin and add the female red JST connector to the other end of the wire, you can ideed add FoC yourself. Use the black wire on the JST, not the red!
Here's the diagram that shows the FoC lead on the board and how it connects to the LED/MLS. (By Vex, no less)
http://www.saberforum.com/index.php?topic=8667.0