In what appears to be an advertorial from Direct2Drive at the English IGN the first available DLC for Civilization V has been mentioned! "gamers who pre-order Civilization V through D2D will also receive the first Double Civilization and Scenario Pack downloadable content when it is made available post-release, currently scheduled for late 2010 (a $10 value)." For completeness sake: The Babylonian Civilization with Nebuchadnezzar II as leader will ship with this sale as well!
Source

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.
...
Wish I'd known about the promo code... I just broke down last night and bought it.
So is this going to end up being a $70 game? $80?
I was going to pre-order this right now. Now I'm going to wait and see what the deal is.
Enough with the shenanigans!