Producer Brandon Adler of Obsidian posted news on the Pillars of Eternity forums with news the next patch is now available on Steam, and other digital services later on.
More information.The 1.04 (540) patch is now live on Steam. It is currently going through the QA process for GOG and Origin and should be available on those sites in the next day or two. We will be posting a backer update regarding the patch later today or tomorrow. You can find the patch notes for 1.04 here.