Ed Boon has confirmed that MK9 is in the works through his twitter account www.twitter.com/noobde.

A few updates to his account:

"Motion capturing special moves & fatalities today....they are kind of sick !!"

"MK9 isn't going to have Superheroes in it."

"People want an M-rated MK....dammit we will give them an M-rated MK."

Even though no detail have yet to be released we can hope for one hell of new Mortal Kombat with a "M" rating. Scorpion get that spear ready!