Nunnally is currently 87th for the throne now that she's back in Britannia, at least according to Newtype
I'll go right out and say that I remain committed to the idea that Lelouch will fight Britannia the way he's always done, as an organized terrorist/militant body instead of as an actual country, expanding the paramaters of the Order to encompass the world instead of solely focusing on Japan like he did in the previous Season, because that's Lelouch's ultimate goal, the world.