So yesterday on Bolter and Chainsword as the news broke about the FAQ and its implications for Jaws a poster said that this also would be the case for Murderous Hurricane.
In essence you would need to roll to hit and then roll 3d6 to see how many hits you had.
Personally I see no sense in this.
Yesterdays FAQ was very simple, you need to roll to hit for a psychic power.
Murderous Hurricane says in the codex that you get 3d6 hits so in fact you are rolling to hit.
That is how I will play it until either GW or a tournament organiser tells me any different in a rules pack but as always I value our readers input.