Engadget is reporting of the possibility of having your Wii bricked after doing a firmware update. It was reported that before doing an update on a modded Wii, they would receive a message stating "If your Wii console has an unauthorized technical modification, this upgrade could cause interoperability of your console."
Nintendo as well as Microsoft recently cracked down modders.
Some new updates that Engadget mentioned included:
"A new digital clock on the main menu, a few "aesthetic changes to the Wii Shop," an updated Forecast Channel window, a "Today's Accomplishments" note on the message board, and a made over Wii Shop that "changes the way Virtual Console games are ordered"
Please report your experiences.