My prediction is that Bush won't say anything each time he answers a question. Ie: "We must stay the course... Me must bring democracy to the region... We are moving ahead..." no details and if asked for details or faced with a challenge he will simply restate the previous statement. This has worked for him for many years. I predict he will appear polished (he can when he puts his mind to it and the format is canned).
Kerry will be boring, non compelling and probably try, at long last, to establish a platform but use too many words. He may try to come off as a hardass to change his bland image.
You can probably look at the press releases for the last month from both campaigns to hear every answer that will be offered.
Charon