Which format, medium and method of sending will be hot in 2013?
It seems like everyone and their mother is quoting @joshm's recent piece on medium.com. If you haven't seen it, might be worth checking out. Particularly interesting I think are his (and his sister's) viewpoints on email.
Is email going out the door? I don't know, but I am finding that many of my friends in college are forgoing email for all but school purposes and sticking with Facebook messages for personal correspondence.