From the post:
Most war games focus on building up military forces and finding strategic ways to deploy them. Players are tasked with finding the weak spots in their opponent’s defensive lines and exploiting them. But they must always deal with the fog of war, never really knowing what’s going on in the minds of the people they hope to destroy. Rising Sun is a game that definitely has a war element to it, but it also offers the new challenge of finding ways to ally with opponents and work together, at least, for a time. In fact, diplomacy and negotiation affect every aspect of the game, from the actions players take, to the alliances that are formed, to the battles that are waged.
And don't forget to check out all of the other Rising Sun previews.