IGN talked to mad katz and they confirmed that they will produce products for Revolution, with a lot of different peripherals and special pads to play the virtual console:
"Nintendo is obviously stressing its Virtual Console service. Can we expect to see Mad Catz NES, SNES or N64 controllers for Revolution as well?
The library of Nintendo games being offered via the Virtual Console is impressive. Mad Catz will support these games with our core controllers and investigation into retro controller shells is currently under way."
The whole inteview can be found here:
http://revolution.ign.com/articles/678/678646p1.html