Wrack gun?

So with the Dark Eldar's codex soon being released, Greggles ha been scouring the net for rumors and updates. I am personally looking forward to an actual Dias of Pain, and the Void bomber. I am really looking forward to getting the actual codex in hand, and seeing where the nerfs are and what good things they have done. One thing greggles pulled out was the possibility of a new Wrack gun. Apparently this gun causes painful and abnormal growth to occur.