Starting October 30th, Nintendo of Japan will offer a playable demo of Shooting Star Rockman 3 via DS Download Stations. The demo consists of the basics of the battle system, most likely giving players a chance to test drive Noise Changes and new Battle Cards.
I'm also told there is a slight possibility that the demo will also appear on "Everybody's Nintendo Channel" on Wii (aka "Nintendo Channel). The channel acts as an online version of the Download Station in which users can download DS demos onto their DS for a limited time (until the system powers off). Most if not all the time, Download Station demos make there way onto the ENC.
News Credit: Thomas, the MegaMan Network