the new emperor.... ***spoilers***
i don't know if this has been brought up before but...
i just realized that, assuming the princesses went ahead and married the 3 soldiers, ting ting and ling would be the successors to the emperor's throne! so when the emperor decides to give up his "emperorship" (or passes away), that would make ting ting the new empress and ling the new emperor.
making ling... general shang's new boss!!??
the beginning of mulan 3?
ps. i'm assuming ting ting is the eldest of the 3 sisters.