I've just been trawling around the Ducati MY2004 web site. Highlights in brief below, and pictures (courtesy of Ducai SpA) at 
http://www.ducati.info/gallery/MY2004/ - the ducati site itself is still largely password protected. 
 - Superbike: 
http://www.ducati.com/bikes/my2004/superbike.jhtml  749R - 116bhp, 80Nm torque. Ohlins forks and shock, radial brakes  18.3l tank, slipper clutch. This looks like the business. 
 999/999S/999R/749/749s appear, at first glance, to be unchanged. 
 - Sporttouring: 
http://www.ducati.com/bikes/my2004/sporttouring.jhtml  ST2 & ST4 no longer listed. 
 ST3: 992cc, 3v/cylinder 102bhp, 93Nm torque, Showa forks, Sachs shock. (web site says 4v engine, but pics clearly show 3v head. 
 ST3/4/4abs all have new top fairing & instruments including remote headlight adjustment. 
 BBG is no longer a colour option 
 
  - Monster: 
http://www.ducati.com/bikes/my2004/monster.jhtml  S4 dropped, range is now S4R, 1000, 800, 620. Can't see any significant changes 
 - Supersport: 
http://www.ducati.com/bikes/my2004/supersport.jhtml  Only 1000 and 800 are listed. 
 cheers 
 Richard