Spinky
Neutral Skipper
There was a Tarkatan with his blades out and with a different design to the rest.One was a tarkatan soldier which is evident due to the other tarkatan soldiers that look just like that one shown.
Jade is the other corpse in the trailer.
The other "corpse" is Kitana. Concept art we've seen from a previous stream confirms that. I don't know why anybody considered her being Jade when she clearly doesn't have the same skin tone.