Wow, that is a busy-looking little videogame all of a sudden. Terraria receives its version 1.1 update on December 1st, and it's one whose contents the devs have been careful not to spill all of until very recently. There will be 222 new items, 39 monsters, female characters, new ores and resultant armours, all sorts of new combinations, wiring and resultant mechanisms, a new lighting system and, naturally, a boss called Wall of Flesh.
The devs reckons this update will completely change the game; I can't speak for that, but I can say v.1.1 looks off the hook bonkers, as you'll see below. The new lighting really pumps up the colour, too.
Wow? Wow. Further details are scribbled about over here.