No, it reveals nothing. Unless I'm blind. Most likely same as Fantasy, LD test when charged, if failed you are WS1 until end of combat.
Man, that could ruin people's day right there on a bad dice roll. Looking forward to some hilarious daemon vs GK fights that become hilarious because of this rule.
EA: The pattern has repeated itself more times than you can fathom. Game companies rise, evolve, advance, and at the apex of their glory, they are extinguished. Bioware was not the first. By utilizing our funding, game companies develop along the paths we desire. They exist because we allow it, and will end because we demand it.