I'm rather surprised there hasn't been a thread about this yet.
So, just two days ago there was a massive update to Terraria that apparently doubles the game's content.
If you already own the Terraria, the game will update automatically upon launch. This is
NOT DLC.
I've been playing the update since it's come out and it's been fantastic so far.
I just thought I'd bring this up for anyone who may not yet know.