I noticed that in Sins, empires can decide to cut off their alliance with you when you and they are the only ones left. I kinda wish they wouldn't do that until a later time; when resources began to run low, economic competition was high, and a cold war was looming. Will Diplomacy act in this way?
Even better, imagine 3 empires all allied to each other in a Federation of sorts. Now that would be impressive.
Or perhaps even two empires that were allied for so long that they decide to merge into one (naturally, the player's).
What do you think? Will Diplomacy do anything of this sort?