Game apparently is easy on the CPU. 

Specifications for Starcraft 2 have leaked out of Blizzard HQ and are unusually high... for Blizzard, at least.

Blizzard has been previously renowned for releasing games that will run on even the most antiquated computers, with the success of World of Warcraft partially credited to its meagre demands on player systems.

The requirements are ripped straight out of a preview from Spanish games rag Micromania, according to a poster on a Starcraft 2 fan site.

Blizzard has yet to confirm the specs, so far only confirming that the game will require Pixel Shader 2.0. Here's the list:

Minimum Requirements:

GFX: GeForce 7/8 Series or Radeon 1000/2000 with 25Mb RAM
CPU: Pentium 4
RAM: 1Gb
Internet: ADSL 1 MBit

Recommend Requirements:

GFX: GeForce 8000 or Radeon 2000 series with 512Mb RAM
CPU: Core 2 Duo or Athlon X2
RAM: 2Gb
Internet: ADSL 3 Mbit

Optimal Requirements:

GFX: Geforce 9000er or Radeon 3000er Series
CPU: Core 2 Duo 3 Ghz or Athlon X2
RAM: 2Gb with DualChannel mode.

Source