Hi, I was just wondering how development for swapnote/swapdoodle is going. I used to use it a lot with my friends and we really miss it. We were just wondering if development has started yet or if it is in development. No rush, we just kinda want to know how it’s going 
They are currently not working on them at the moment. As with most 3DS and Wii U games, it will most likely be worked on in the future. However, Swapnote works currently with StreetPass Relay to send notes to your friends. As always, No ETA for when it will be supported fully.
Neither of these games/apps’ NEX servers are currently in development. However, they do still work with Pretendo’s Streetpass Relay system, as was stated above.