They are roughly the same as FM 2010, so if you could run FM 2010, you should be able to run FM 2011 as well. If you are still unsure, you will be able to try how your computer copes with the demo that will come out...
Those are the minimum specs, and not the recommended ones.
PC System Requirements
OS: Windows XP/Vista/W7
Processor: XP : 1.4GHz or Faster, Vista/W7 : 2.0GHz or Faster
Memory XP : 512MB RAM, Memory Vista/W7 : 1.0GB RAM
Graphics: 128MB Supported Chipsets - Nvidia FX 5900 Ultra or greater; ATI Radeon 9800 or greater; Intel 82915G/82910GL or greater. Earlier cards may only display 2D Match Viewer Mode and are not supported
DirectX: Version 9.0c (included)
Hard Drive: 2GB
Sound: DirectX 9.0c compatible
Mac System Requirements
OS: OS X version Leopard 10.5.8, Snow Leopard 10.6.3, or later.
Processor: Intel Processor
Graphics: Nvidia Geforce 7300 GT or greater; ATI Radeon X1600 or greater