Watch Dogs' creative director Jonathan Morin has taken to Twitter to confirm the official minimum specs required to play the forthcoming Watch Dogs on PC. There has been no announcement yet with regard to the recommended specs in order to get it playing the way it was intended, but you should be able to put together some reasonable estimates based on the following...
Processor: IntelCore 2 Quad Q8400 2.66Ghz or AMDPhenom II X4 940 3.0Ghz
Memory: 6GB RAM
Video card: 1024 VRAM DirectX 11 Shader 5.0
Sound Card: DirectX9
Hard drive: 25 GB
So, it's not going to require a powerhouse to run, at least, but it's likely that the recommended specs could turn out to be quite hefty. It was recently announced that the game would launch on Xbox One, Xbox 360, PlayStation 4, PlayStation 3 and PC on May 27th following a substantial delay that saw the title pulled from its originally planned November releases last year.