I am interested in this too. Are you sailing the January 31, 2004 Western? There is another thread started to see who is going. The Super Bowl (XXXVIII) is scheduled for February 1, 2004.
The recent NCAA tournament championship game was Monday night while we were on the Wonder. In addition to it being on in the ESPN Skybox, they set up a screen to watch it in Barrel of Laughs. So, I would think they will show the Super Bowl somewhere else too, hopefully somewhere big enough to accommodate everyone who wants to watch it!
Maybe someone else who has been on a Disney ship for the Super Bowl can answer this.