Blizzard announced the requirements for Starcraft 2, similar to WOW, but remember it´s still a beta.
Minimum Requirements Starcraft 2
Processor: Intel Pentium IV 1.3GHz, AMD Athlon XP 1500+
Operating System: Windows XP / XP64 (SP3), Windows Vista / Vista64 (SP1), Windows 7 Home Premium
Memory: Windows XP - 512MB, Windows Vista / Windows 7 - 1024MB
Video Card: 3D graphics processor with Hardware Transform and Lighting with 32 MB VRAM such as an ATI Radeon 7200 or NVIDIA GeForce 2 class card or better
Hard Drive Space: 15GB
Recommended Requirements Starcraft 2
Processor: Intel Pentium D, AMD Athlon 64 X2
Operating System: Windows XP / XP64 (SP3), Windows Vista / Vista64 (SP1), Windows 7 Home Premium
Memory: Windows XP - 1024MB, Windows Vista / Windows 7 - 2048MB
Video Card: 3D graphics processor with Vertex and Pixel Shader capability with 128 MB VRAM such as an ATI Radeon X1600 or NVIDIA GeForce 7600 GT class card or better
* Hard Drive Space: 15GB