The best bet is to wait until after the game is released but I did find this:
Minimum System Requirements
* OS: Windows XP, Vista or Windows 7
* CPU: Core 2 Duo 2.0 GHz or Althon X2 2.0 GHz
* RAM: 3 GB
* HDD: 15 GB
* Graphics: 512 MB card
* Sound Card: DirectX 9 Compatible
* DirectX: Version 9.0c
Recommended System Requirements
* OS: Windows XP, Vista or Windows 7
* CPU: Core 2 Quad 3 GHz
* RAM: 3 GB
* HDD: 15 GB free disk space
* Graphics: 512 MB Graphics Memory
* Sound Card: DirectX 9 Compatible
* DirectX: Version 9.0c
Supported Graphics Cards:
Minimum – 8800 GT
Recommanded – Geforce GTX 460/Radeon 5850
* It appears your system should run it fine. If you want to upgrade you could go a Phenom II quad core and a GTX 460 or ATI 6850. Right now the AMD quad cores are selling cheap.
With the latest BIOS you could even run a 6 core but a quad should do you fine. See this link:
http://hardforum.com/showthread.php?t=1515656
*** Just make sure you do your homework on your motherboard to double check any changes you want to make. My personal opinion is to save up your money and build a new system within a year because your hardware is above the minimum requirements as it is with your cpu the only possible need to go to a quad core.