Yes it is true. Nintendo recently made the announcement that they will be pulling the plug on wifi for the DS and Wii on May 20th.
This means that online play, free add-ons, and leaderboards will all become inaccessible for DS, DSi, and Wii devices. The shutdown also includes the function of being able to play Wii games on Wii Mode for the Wii U. The games however will continue to function normally while playing offline.
Nintendo made the decision to keep the Wii Shop Channel, Nintendo DSi Shop, and on-demand video service for the time being, but for those who enjoy online play will now be forced to make the switch to the more recent Wii U and 3DS devices.
13 news items
Amazon Reveals Unannounced Modes for Wii U Version of Smash Bros.
Another day, Another Smash Bros. leak
Fifth Annual NES Marathon scheduled for November 8th
More than 750 Games, 2 friends, and 1 great cause
Game Freak Exploring Amiibo Functionality
Gotta buy 'em all
Donkey Kong Country Returns to Virtual Console!
Only in Europe...
Nexis Games Releases New UCraft Information
Digging through the details
October CoroCoro Shows new details and Mega Pokemon for Omega Ruby and Alpha Sapphire
Bees, and birds, and dragons. Oh my!
GameCube Controller Confusion
You got my hopes up and then dashed them expertly, sir.
Fifteen "Nindies" Announced for IndieCade 2014
A glimpse into the future
Finger Gun Games Interview
Heuris, Stone Shire, and the future
Wii's World is not officially affiliated with Nintendo! (but they wish we were).