Developer Ironclad doesn't call Diplomacy, the second add-on to its popular PC space strategy title Sins of a Solar Empire, an expansion. It's called, fittingly, a "micro-expansion."
Rather than add a host of things that "clip on" to the existing title - new races, etc. - Sins Of A Solar Empire: Diplomacy instead seeks to weave additional focus on diplomacy into the very fabric of a game that until now has mostly been about shooting anything that moves.
So, can Diplomacy prove that there's hope yet for world intergalactic peace? Or is war all this game is good for?