So, far every major arc of the story shows off the main characters learning a new move.
Ex- Naruto starts off w/kage bunshin, "learns" to kyubi out the end of the haku arc, then learns the summoning jitsu at the end of the chunnin arc, then the rasengan, now the super-kyubi-defense +mega rasengan, etc...
Sasuke also developed his 1st sharingan, 2nd, then the seal, then the chiodori, etc......
So, what do you think is coming up next?
Not just for the major characters either- what about neji, or choji? Or *gasp8 Sakura?