Mulan III

Mulan 3 was a planned sequel to the 1998 film and the 2005 sequel Mulan II. It was planned for a 2007 release.

Plot
A few months after Mulan II, Fa Mulan must help a Chinese maiden named Wei Hua to save her father Wu Takashi, who is imprisoned in Japan.

Why it was Cancelled

 * 1) Mulan II got extremely negative reviews.
 * 2) John Lasseter called off all future direct to DVD films after being appointed as head of Disney in 2006.

Result

 * Mulan 3 was permanently cancelled.
 * The live action reboot of Mulan is scheduled for a 2020 release.