Wow, it's been a minute! And the craziest thing is this patch should have been out well over a year ago.
This version 4.1 in particular is more of a hotfix revolving around Hurvey but expect more meat in the upcoming releases leading up to the free DLC. I won't ramble and just say that there's a lot more to come. Here are the most recent changes:

Gameplay/Mechanics

• Experimental sales algorithm
  
• A whole bunch of hidden so-kind-of-irrelevant multiplayer stuff
  

UX/Visuals

• New portrait, overworld and set art for Hurvey
  

Bugs

• General stability fixes
  

For more information on upcoming releases see our full changelog.