Judging about how the Jan hours changed, the chance of an additional night of Fantasmic seems slim, but the odds of adding a 2nd showing on the nights they do have it are high. (the "final" schedule will come out in about a week)
However, it seems strange that there is Fantasmic on Wed the 9th instead of Thurs the 10th (the pattern, as PP said, was Fantasmic on Thurs and Sun)
But because of the Fantasmic dining package, it is unlikley they would move the show date from the 9th to the 10th.
Sorry, OP, but it looks like you'll have to choose between EMH at MK and Fantasmic (unless you can stay late on check out day, or extend your trip one day).