With the recent announcement of a demo becoming available for Civilization V in the near future, along with a whole host of other announcements which are specific to gameplay, the system requirements have also now become available which are as follows:

Minimum System Requirements:

Operating System: Windows XP (SP3)/ Windows Vista (SP2)/ Windows 7
Processor: Dual Core CPU
Memory: 2GB RAM
Hard Disk Space: 8 GB Free
DVD-ROM Drive: Required for disc-based installation
Video: 256 MB ATI HD2600 XT or better, 256 MB nVidia 7900 GS or better, or Core i3 or better integrated graphics
Sound: DirectX 9.0c-compatible sound card
DirectX: DirectX version 9.0c

Recommended System Requirements:

Operating System: Windows Vista (SP2)/ Windows 7
Processor: 1.8 GHz Quad Core CPU
Memory: 4 GB RAM
Hard Disk Space: 8 GB Free
DVD-ROM Drive: Required for disc-based installation
Video: 512 MB ATI 4800 series or better, 512 MB nVidia 9800 series or better
Sound: DirectX 9.0c-compatible sound card
DirectX: DirectX version 11

Other Requirements: Initial installation requires one-time Internet connection for Steam authentication; software installations required (included with the game) include Steam Client, Microsoft Visual C++2008 Runtime Libraries and Microsoft DirectX.

The official Civilization V website has a great community, keeping all fans up to date constantly with new information to keep everyone wanting more, the following items were announced on there first.

The announcement of a demo for Civ V was posted in the community section, informing fans that there will be a demo at some point before the release of Civilization V on September 24th (September 21st for North America) also don't forget there's a collector's edition coming out.

If you are interested in Civilization V we recommend bookmarking the official website as they're keeping fans up to date with changes to the game in comparison to the previous titles, for example changes to gold, happiness, workers, technology quotes and much more. You can even read about how there is now an official "Sid Meier's Civilization V Day" in Maryland on September 21st.