Big news for those holding on to their Wii and DS product registration codes.
http://www.nintendoworldreport.com/news/36858/club-nintendo-post-play-survey-rules-updated
Club Nintendo North America has updated their rules for Wii and DS post-play surveys. Beginning April 7, 2014, newly registered Wii and DS games will no longer be eligible for 10-coin post-play surveys. Wii and DS games will, however, still be eligible for initial product registration surveys.
According to a Nintendo Customer Service Representative, Wii and DS game post-play surveys that expire after April 7 and are currently in a Club Nintendo member's To-Do list will not be deleted when the new rules go into effect.
Additionally, Nintendo has pointed out that starting on April 7, all newly earned post-play surveys for all games will have to be completed 30 days after they are issued.