I have heard both arguments for how the new 'Nid Doom of Malan'tai power life leach (or aura or whatever it is called that forces ld tests on 3d6 and causes a wound for each point you fail by) works and if it works against units in vehicles. For the purposes of the tournament in March, will it effect units in transports or not? And if so, will units in transports also be able to be targeted by other non-shooting psychic powers such as Eldar's 'Doom'?

There are a several questions in your inquiry, I'll address them each in steps.

1. I do not plan on making a ruling on the Doom at this time nor in the future if there is no further official GW FAQ made by the event date.

2. I truly doubt the Doom of Malan'tai would be much an issue since there are so many much better choices in a Nid's army. If a person really bring one, then each turn the p_layer_s can D6 the rulings if they can not come to an agreement.

3. The Eldar Doom question is answered in the most recent 40K general FAQ.

Cheers