Blizzard published the recommended system requirements for StarCraft II, and the good news is they're not astronomical.
Mac requirements are higher than those on PC, and we've discarded the minimum set-ups: you'll be able to run StarCraft II, but only just.
Recommended for Mac are an Intel Core 2 Duo processor, 4GB of RAM and an NVIDIA GeForce 9600M GT or ATI Radeon HD 4670.
Recommended for PC are a Dual Core 2.4Ghz processor, 2GB of RAM and either a 512MB NVIDIA GeForce 8800 or ATI Radeon HD 3870. Anything newer equals better, obviously - but a Voodoo2 will no longer cut the mustard.
StarCraft II runs on Windows XP, Vista and Windows 7. You'll need 12GB of free hard-drive space to install the game.
Full specifications can be found on the Blizzard website.
StarCraft II will launch simultaneously for PC and Mac on 27th July.