Reddit, the so-called "front page of the internet" is not just for quick links. There's also varied discussion topics, and one very popular feature is an "Ask Me Anything" session, where one user can state who they are and/or their profession, and for a period of time anybody can ask them questions.
Adding to the flurry of excitement for Terraria's latest expansion/update, Redigit (the lead developer coder man-thing) has hosted a session. People have asked (and he has answered) all sorts of questions ranging from technical changes to the engine, tactics and balance changes, to even questions about his own life and programming experience.
While Redigit has tried not to provide too many spoilers (instead opting for generic descriptions and numbers above names), there's still plenty of info about what's in the new update, so if for some reason you don't want to know ahead of time, you might want to skip out on this read.