The Imperial Legion. I will be disappointed if it didn't make the cut. Considering the state of the empire, it would be more than appropriate to have it incorporated into the game.
Hmm, I think you're right. The Imperial Legion makes sense to put in Skyrim. The Empire seems to be experiencing dissolution, and there is a brink of civil war. So, if the Empire is still around by then, then yes, the Legion should make it in as a playable faction. I think you should also have an option to become a rebellious general, taking charge of your own unit or army, if you so wish. Think of the fall of the Roman Empire, they fell because of rebellion and disunity. The same should be apt to happen to the Empire of the Elder Scrolls, right? At least make it possible to achieve, if not automatically happening as a part of the main quest.