Walk through objects.

When you threw a shuriken at some objects (like the red fence in leaf, or the wall at VOTE) it's density is gone. It is most likely connected to the new projectil stuff. Seems like a shuriken just deletes the density.
I actually made this topic because a lot of player said they got stuck in the mountain during sasuke mission. By threwing a shuriken you can simply walk out of the mountain.

EDIT:
This can also be abused, to enter sand hospital and kill ppl there. Just randomly tried in sand, and i could enter the hospital without problems.