imo i'm not even waiting for 1.3 anymore
terraria never had much of a traditional story that starts and ends somewhere. it never really had any story at all. as such, it's pretty much a finished game
sure the additions in 1.3 might be nice but there's little they could do to actually refresh the game. it's a great game, people had fun with it.
terraria doesn't have a story because it's a sandbox adventure game. you create your own story and adventure. it's actually a lot better than forcing the player into a quest system. it allows for more freedom
when minecraft added the ender dragon as their "story" i thought it was stupid and redundant. why would you need an end boss to a sandbox game? why only one boss?
when starbound added stuffty "get coffee, catch bugs, make a cup" missions, I stopped playing. I tried the new update and i was really disgusted at how they held your hand through the entire game. I want to play the game and figure out things on my own. if i want a guide I'll go look up a wiki ffs
not every game needs a story to be good. this game is meant to be progressed at the same level as the player. If you're good at the game you'll progress fast, if you're bad you'll complain about how hard the game is and why you're too incompetent to challenge yourself