GameStop now offers minimum and recommended system specifications for Battlefield 3, DICE's upcoming military shooter sequel (thanks VG247). There's no indication that these are official, so our minimum approach is to view them cautiously, and our recommended approach is that you do so as well, though the Windows Vista as the minimum OS is accurate, as we've already learned the game will not support Windows XP. Here are the specs:

Minimum
Hard Drive Space 15 GB for disc version or 10 GB for digital version
Operating System Windows Vista or Windows 7ProcessorCore 2 Duo @ 2.0GHz
RAM 2GB
Video Card DirectX 10 or 11 compatible Nvidia or AMD ATI card

Recommended
Hard Drive Space 15 GB for disc version or 10 GB for digital version
Operating System Windows 7 64-bit
Processor Quad-core Intel or AMD CPU
RAM 4GB
Video Card DirectX 11 Nvidia or AMD ATI card, GeForce GTX 460, Radeon Radeon HD 6850