Plot spoilers ahead. You've been warned.

I see Nanamo resigning as Sultana only to be reinstated later on by proving her worth in some fashion. Teledji will take over in the interim and ruin everything while Nanamo, and the warrior of light, come to the rescue.

Omega Weapon will be activated, giving us another super powerful boss to destroy. My hunch is it won't be at its full power when we fight it. There will be some event to give us a window of opportunity which hinges on Omega not reaching its full potential. Teledji will either die in the resulting destruction of Omega or be arrested. Either way, happiness will ensue.

A means to combine the aether gathering Tsupimati and the device to create a blade of light will be found, giving the Ascians a genuine reason to soil themselves in fear. They now see us as a true threat and bring their dark plans forward to complete them before we can interfere.

Fighting ensues between Ishgard and the dragons in force, and they reluctantly open their gates to accept adventurers as reinforcements to their ailing armies. They are distrusting of us and see us as a tool rather than a people. An attempt to broker a lasting peace between Ishgard and the Dragons will go poorly resulting in a big battle, and forcing us to take sides. We learn the truth of the war, and find that Ishgard has a lot to answer for. Ishgard likes us even less.

Midgardsormr will also be a shish-kebab on my Dragoons lance, roasting over Ifrit's fallen corpse. (How's that for a test, you mean ol' dragon). Why? Just because he still hasn't apologised yet.