May 20th will be the last day for all of the Nintendo Wii and Nintendo DS services.
Both platforms will retain their store functionality, but online play, matchmaking, and all leaderboards will end up kaput.
Official statement from Nintendo below:
As of May 20, 2014, certain online functionality, including online play, matchmaking and leaderboards for many Wii, Nintendo DS and Nintendo DSi games, will no longer be accessible. For a list of Nintendo games and services that are affected, please check http://www.nintendo.com. Users can still play these games in offline mode, which continues to offer a rich game-play experience. Other online functionality on Wii and Nintendo DS, such as access to the Wii Shop Channel, the Nintendo DSi Shop and video-on-demand services, are also not affected at this time.
Online play for Wii U and Nintendo 3DS games will be unaffected (aside from the Wii mode on Wii U and Nintendo DS games played on Nintendo 3DS family systems).
Our focus now shifts to readying our Wii U and Nintendo 3DS matchmaking services for upcoming games such as Mario Kart 8 and Super Smash Bros.
We at Nintendo sincerely thank our fans for their continued support of our company’s legacy systems. Your enthusiasm for games made for these systems speaks to their longevity, and the passion of Nintendo fans.
The following items will continue to work after those bits have been killed off:
- Internet Channel
- Nintendo DS Browser
- Nintendo DSi Browser
- Nintendo DSi Shop
- Nintendo Wi-Fi Connection Pay & Play
- Wii Shop Channel
Major titles affected will include Super Smash Bros. Brawl, Mario Kart Wii, and all DS Pokémon titles including Black, White, Black 2, White 2, Platinum, Diamond, Pearl, HeartGold and SoulSilver.
We knew you well, online functionality. May your journey to Video Game Valhalla be safe and true.