The Classic Controller Pro, which was first released in Japan, has dual shoulder buttons and DualShock style grips and will be making its way to the US in April. The controller will be bundled with the new Monster Hunter Tri game but, can be purchased separately.
The game is compatible with the Wii Remote + Nunchuck combo and of course the Classic Controller. Separately the controller is available in black or white for $20. The bundled game and controller will retail for $60.