i think i found a picture of Li Mei holding a sword that everyone is talking about. go find the thread called "Changed?" the thread is made by scorpion555. when you go in this thread, go find a picture of Li Mei and there she is, holding the sword. (the sword looked like Scorpions new weapon)

Maybe the thin sword is shang's Straightsword from DA. Li Mei may have stolen it from him when she escaped thanks to Bo' Rai Cho.