Nemo 2 won't come out until 2015 at the earliest. Which probably means we'll see it in 2016, unless, like Cars 2, it was finished ahead of scheduled because one of their films was dropped in production (Newt), then we'll see it 2015. There's still 2014's Good Dinosaur, which is still in production. Dunno about Untitled mind film or untitled Dia De Los Muertos film. They'll probably be in production at the same time.
Still, the only Pixar film dropped out of production was Newt, no thanks to inferior films with the same plot... Rio and the "no need to exist" Alpha and Omega.