If you mean Plug&Play as in using an Xbox 360 or PS3 Controller with that charging cord (that you can use with the original game system), then no you can't use it on the Wii. You can play Brawl with a USB X360/PS3 controller using a Wii Emulator.
He means the Plug&Play .rel ports.
But to answer the OP's question...Currently no.