Although there was an update yesterday (15th, UK time) that fixed a few things including adding support to update AMD/ATI video drivers and improving in-game overlay compatibility with some third-party software, the new update is quite a lot less and simple.
- Added support for Civilization V charity promotion (not visible until Civ5’s launch)
That’s it. You’ll probably already know if you have Steam open or have opened the client before reading this, but if not, it will apply after starting the Steam client as usual.