I just received news from k3ds official reseller DSGamerWorld,K3DS cards will in stock in August,2014.The official site release a news:
OnlineID Gen Release
Today we proudly release the first file: a application that creates OnlineIDs to be read by K3DS. This tool can patch scene dumps to work online. You can find more information in readme in download and in download section.
I can not find any information from official site, anyone get the leaked news?