Untouchables are in the Beta as an Elite Advance, but with curious effects.
Purchasing the Advance grants him the Soulless talent, which does nothing other than a nebulous "uncomfortable to be around, psykers withing WPb metres of the character feel pain." He can then spend xp to advance through a talent tree that reduces enemies' PR, gains bonuses to resisting psychic powers, and can increase this protection to those around him, but can never actually become a full-on Untouchable.
I am not a big fan of this interpretation. While the abilities are fine, Untouchables should (in my eyes) take a penalty to Fellowship, and have the ability to become immune to psychic powers, as they always have been.
Thoughts?