If you're like I was, then you're probably wondering where your email with demo codes is. I still hadn't gotten my codes, and knew I met the three qualifications:

1. Achieved Platinum Status for 2014 Club Nintendo year (between 7/1/2013 and 6/30/2014).
2. Registered any Nintendo 3DS product (hardware or software) before the promotion.
3. Enabled the setting to receive information from Nintendo before the promotion.

I was worried that something had gone amiss, since they should've been done sending out codes by now.

So I called Nintendo support (1-855-214-2043) and was told that, as it turns out, they had already sent out all of the emails. Something went wrong and the email was never sent, but codes had been generated and associated to my Club Nintendo account. After realizing this, they were quickly given to me over the phone, and later forwarded in an email.

So, if you still haven't gotten your codes, don't keep waiting hoping they'll get to you. Call support and have them verify you qualify for the promotion, they'll get you sorted out. And if you talk to someone who tells you that codes are still being sent out, then ask to talk to someone else, as that person is mistaken.