FoK 3.6 will have a finished Black Templars race with almost everything their Codex allow them to get plus more stuff from Imperial Armour. Venerable Dreadnoughts, Terminator Command Squads, Combat Shields and Storm Shields for Sword Brethren are some the new stuff they are getting, all of this is gonna be fully textured and Team Colorable. Yup thats right, black templars will support any color scheme the player desire.
Black Templars Commanders will perform a more centric role now since they have a new set of supportive abilities and are fully customizble, they can be equipped with any wargear configuration possible, much like Space Marine Captains and Chapter Masters in 3.5. These new abilities are the Auspex, allow the commander to increase his sight range and detect nearby infiltrated enemies, Holy Orbs of Antioch are special grenades which can cause devastating damage to infantry, the other ability is one that represent the "Crusader Seals" on commanders, those who play Table Top know that Crusader Seals improve the effects of "Righteous Zeal" (An universal trait of Black Templars that makes them mad sprinting forward to avenge their fallen brothers). Well this ability can only be activated when the commander is attached to squad, it will increase the movement speed and close combat skill of the squad for 35seconds, then it will require 2 minutes to recharge.
Here are some videos about Black Templars, enjoy!