only Quan Chi , Kitana, Kenshi, Blaze and Frost gota a kata. And I think nobody "can perform" a kata coz its in the demo. And as i noticed Kenshi's and Blaze's kata are the same. (maybe coz of their style TAI CHI)

yeah I know that u can see it in the demo that ́s why i thought that we gotta be able 2 perform one in the game id try it with frost but it ́s 2 hard 2 handle-
my bro told me that he did one that ́s why im askin
-it would be fat ass ,if i could perform blaze kata ,or did u saw kitana ́s boob shaker :)love that move!

I think there's a hidden menu in the game that allows you to select a fighter's kata. It wouldn't make sense if there were katas for only a few fighters.
It could be like MK3, where there was a hidden menu to view a fighter's bio or win screen. Maybe that way you can select who's kata you want to view when you complete arcade mode.
Just a hunch.