Thank to this tip from AudioRevolution I know that ESPN is going HDTV at the end of March 2003.
ESPN HD will include 100 live telecasts in its first year featuring Major League Baseball, the National Basketball Association, the National Football League, and the National Hockey League — produced and distributed in high-definition HDTV.
The resolution on ESPN HDTV will be 720p like parent company ABC. Where can you see ESPN in HDTV? This is no answer yet as ESPN is currently in negotiations with Cable and Satalite providers.