1. How big a role do you perceive it playing?
I see the war playing a major role throughout the first act of the game, and I imagine it will be resolved by the end of the first act.
2. How many missions do you think will relate to it?
There will probably be a major quest chain dealing with putting and end to the war, and depending on which side you choose to aid will make certain sidequests become available.
3. What do you think will be the lore-consequences from what we know?
Which ever side you choose will become a much more influential and dominant faction within the game universe, and will likely see greatly expanded influence and power.
4. How devastating do you think the war has been?
The war has probably been fairly devastating with towns and villages burned, and fields left scorched and barren. The results of a total war.
5. How would you like to resolve the war?
I personally would like to see mages restored to power, and the templar order and the Chantry ground into ash, eradicated and wiped from memory.