Just seen this, and there's no changelog for it. I can't find anything related to this update on Steam. Anyone have any idea what it is? Presumably bug fixes or optimization since it's so small.
EDIT: So I've played around a little bit, and the game does run better now, even on my craptop. The game is smooth and it stutters less often. I also noticed some UI changes, but I might be mistaken. I'll wait for the official changelog.