User blog comment:NewcreatureinChrist777/Mortal Kombat 10 Roster/@comment-1773116-20110905002232/@comment-422853-20110908194452

Boon said no gameplay clone characters, and those two exactly fit the bill...

Would've been interesting if they made Khameleon's moveset more original though and had been part of the story in MK9, due to her vendetta against Shao Kahn. But Chameleon's a copout with little to no backstory, so he shouldn't ever come back unless they plan on making something better out of him, both moveset and plot-wise.