The developers of Terraria have recently commented on a reddit post, and they mentioned Linux is still planned for the game.
It’s exciting news, as it’s a game I’ve always wanted to properly try, and now I should get the chance. We already knew they were planning it, but they went quiet about it until now.
QuoteJust to add to this, and reiterate what /u/Shadow1591 said, it is very much something we're planning for, or shortly after the release of 1.3. We definitely take both Mac and Linux gamers seriously. :)
I already have too many games!
About the game (Official)
Dig, Fight, Explore, Build: The very world is at your fingertips as you fight for survival, fortune, and glory. Will you delve deep into cavernous expanses in search of treasure and raw materials with which to craft ever-evolving gear, machinery, and aesthetics? Perhaps you will choose instead to seek out ever-greater foes to test your mettle in combat? Maybe you will decide to construct your own city to house the host of mysterious allies you may encounter along your travels?