I've just downloaded the app and sent some season's greetings to a few people. Quite fun little application. Had a little "chat" with Nathan just now. I think he's doing fine.
Also, the different features only get unlocked one at a time, 3D drawing, attaching photos, including background templates, but somehow I seemingly haven't unlocked sending sounds yet. Sound would be nice to accompany those pics I sent to Nate. lol
Oh, also still haven't found anything on a US release yet, but we at least now know the app is going to be called Swapnote there.