I have submitted this as a news lead to MKO and some of us may already be aware. I hope this isnt out of place being another websites find and if so, I apologize to the MKO moderators.
Over at totalmortalkombat.com, I was getting really bored and decided to see what news they had. To my surprise, a screenshot of watching one of the confirmed accounts of Ed Boon called "MKNoob" shows him actively playing and his system reading a game called "MK9"
This is said to be confirmed as Boon by a trustworthy member. 100% i cannot say. But the MK9 label is pretty big.
I wont paste the photo itself because the find is that of totalMK but I will link you to the page on their website that contains the photo.
http://www.totalmortalkombat.com/news/index.php Again I apologize if I am out of line with their news article.
-Casselman