Right now I'm going to guess that the God-King is a puppet, figuratively and/or literally. Siri, Vivenna, and Lightsong will probably overthrow the power behind the throne, narrowly averting a disastrous war. Not sure yet what will happen with Vasher and Nightblood, though I'm very interested now in the theory that Nightblood ends up on Roshar.
Another thing that's interested me is how transformative the Shard can be. Elantris and Warbreaker alike have ordinary humans changed into godlike beings, and if you add in the wraiths from Forests of Hell, it begins to seem like radically changing/resurrecting people is a common theme in the magic of the Cosmere.