I can definitely see storybricks being used as part of a diplomacy system. From what we saw in the little video presentations, storybricks could replace the whole card game aspect with something that feels much more natural.
I also remember Brad talking heavily about the "Advanced Encounter System" Vanguard was supposed to have. It was supposed to be Vanguard's non-instancing solution to the overcrowding problem. Encounters would have been spawned in the world dynamically for a certain group/player; others would be able to see the mobs/encounters but they would be pre-tagged to a certain group or player. The "Advanced" part is that scripts could chain one another and have your group wandering from one part of a dungeon to another. They never managed to make it work. This could be one of the techs they are going for. Rifts have the same basic idea, but the way the AES was described Vanguard would have gone much further than Rift ever did.
I wasn't in the earlier Vanguard betas that had the first combat system, but I remember it involved a lot of action/reaction. Eg a mob would begin an attack, and you would have X seconds to use a Counter. There was a big of that left in the final product, but it was a VERY simplified version of what they had in mind.