Another Terraria update? It's as if someone dared the developers to execute the best post-release support in the industry, and now they just won't back down. Seriously though, good on 'em!
Today's PC update is less about content (though you can expect crystal furniture and developer armor sets) and more to do with features that'll keep Terraria looking good now and into the future.
Folks playing at higher resolutions should greatly benefit from the new "Zoom" and "UI Scale" sliders, and there's also support for more languages and bug fixes. Also, this nugget: "NPCs who are manually assigned to a room will attempt to return to it when they respawn after being slain."