Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments. Jade is often referred to by either of two different silicate mineral names: nephrite, or jadeite. From Wikipedia
Producer Todd Garner's behind-the-scenes photos hint at the inclusion of characters Shao Kahn, Kitana, Quan Chi, and Jade, with speculation of the sequel heading to the realm of Edenia.