From April 7th, Nintendo are planning to implement some changes to the way Club Nintendo currently works for those in North America. More specifically, post-play surveys are being tweaked.
First of all, you will no longer be able to complete any 10-coin post-play surveys for the now outdated Wii and DS games. You can still complete a survey at registration, but not at a later date for. As well as this, all eligible games will now be subject to a 30 day post-play survey deadline after they are issued.
While it is not clear if these rules will spread to other territories in future, it is an interesting move from Nintendo to stop players becoming complacent when it comes to completing their surveys. For more information on how to collect coins for Club Nintendo, be sure to read up on all the conditions on the official website.