The computer looks like it as a good chance of winning. It is however, more likely to mess up the harder questions.
If the computer wins the next challenge should be hooking the system into a voice recitation system. This would slow the time the computer, and allowing the humans a greater chance to buzz in. Currently they are sending a text file to the computer of the clue. It does not have to process an audio signal to gain the information in the clue like the human players. this would be a more difficult problem for the IBM to solve.