A reader of this Starcraft fansite’s posted what looks to be a set of system specs for Starcraft II. Apparently they came from a Spanish mag who recently visited Blizzard. And here they are:
GFX: GeForce 7/8 Series or Radeon 1000/2000 with 256 MB RAM
CPU: Pentium 4
RAM: 1 GB
Internet: ADSL 1 Mbit
GFX: GeForce 8000 or Radeon 2000 series with 512 MB RAM
CPU: Core 2 Duo or Athlon X2.
RAM: 2 GB
Internet: ADSL 3 Mbit
GFX: Geforce 9000er or Radeon 3000er Series
CPU: Core 2 Duo 3 GHz or Athlon X2
RAM: 2GB with DualChannel mode
No idea if these are real or not. Blizzard will verify soon enough, no doubt.