What you will be able to change or not in the game, you will see. What we are trying to do is give the player a believable context to his actions.
I have 2 things to say about dynamic campaigns in the context of games placed in World War 2 - in other words "known history".
The first one is this - consider the aspect of the victorious allies. Would I be playing the good guys (US Submarines in Pacific for example), should they win no matter what?
If I were the Swordfish pilot hitting the Bismarck, should history continue unaltered if I miss my shot? Would that be believable?
Or substitute yourself for this man:
http://en.wikipedia.org/wiki/Malcolm_David_Wanklyn. If I don't live up to his actions, should that not matter?
The second aspect is this:
If the consequences of my actions - regardless of the role I play in the game - do not matter, why do I bother playing my part?
We aim to teach players history by showing the REASONS and the possible CONSEQUENCES for engagements.
Take the example of the Bismarck. That ship was not just cruising to serve as target practice for the Royal Navy. They were trying to break out in the Atlantic and wreak havoc on British Trade. Would their success have mattered to any extent?