SNKPlaymore has updated the KOFXIII Official blog with a short write up about the recent location test held in Japan, as well as a few photos from the event.
Apparently EX Iori was available to play, and according to the interview with Dune he sounds like he'll be a very strong character.
Also it's a little blurry but check out the video uploaded onto SPEKSNK's Youtube channel where you can kinda see a little gameplay with EX Iori.
[Edit]: Also if you check out Cyberfanatix you can see more photos of the flyer that was handed out at the location test, as well as a clearer silhouette image of the mystery characters to be added to the game.
I'm guessing it's Chang and Choi. xD