Sigh. This is not new at all. The whole army can do that in the old codex and now only one squad as a heavy support choice can.
That's like taking power from pain and drugs from dark eldar, split up the effects to different squads. Example wytches only get drugs and d6 movement. Warriors only get fearless, etc.
After doing that you roll d6 to see which unit can use it's effects and by the way you still have to earn pain tokens.