On the new series of Ninjago: Masters of Spinjitzu, on you tube, pink zane (or whoever) reads cave paintings saying that one snake tribe will unite all the others, so they can find the silver fang blades to unleash the Great Devourer which will consume the land and turn day into night. This might be the main story of Ninjago 2013. It could also mean that there might be another snake tribe and a "great devourer" minifigure. It says all this at [1].