The full list of fixes can be found here, but the main thrust of the patch is that the AI will be improved, the values for units and buildings have been tweaked, the diplomacy has been make a little more transparent, including a tooltip that shows why a leader is happy or angry (which was included late in Civilization IV - why wasn’t it there in the first place?), and some user interface improvements.
Let us know if the Civ V experience is improved post-patch.
