A new Civilization 5 patch has been announced by 2K Greg on 2K Games Forums. Here are the Civ5 patch notes and what 2K Greg says about:
Here's a fun surprise for you guys to read over the weekend: Patch notes for the upcoming "Fall Patch!"
There's no ETA for this patch at the moment other than "fall"

There are some popular requests in here that I bet will make some of you very happy.
And so without further ado:
Modding Addendum
The DLL source code will be released with the fall patch, allowing modders to compile modified DLLs for their Civilization V mods.
BUG FIXES
General
Mod Browser - The "Get Mods" button is now hidden if the user has disabled the steam overlay.
...