The other alterations will come in battle itself, specifically sieges.
That could be a dramatic change, given that one of the most important aspects of CK II is the need for a Casus Belli to not only declare war but to inform the goals of a war. The major shift will be in the causes of war, which will no longer require justification in every instance. We already knew about upcoming geographical expansions in Crusader Kings II, making areas that were previously impassable playable, but fresh news arrived in today's dev diary and it involves changes to fundamental systems.
Forget everything Fallout has ever taught you because war is changing.
