Twilight 2013 GM Wanted
2013 is basically a whole new rule set. It works off of a tiered-system that determines how many dice are rolled for an action (1-3 skill points, 4-7, 8-15, 16-31, etc., each adding another dice to the pool used to determine success).
Char-Gen Is different too, a bit.
And of course the background has been changed & updated for the fact that the game takes place in 2013.