IO Interactive's stealth game Hitman: Absolution is on the horizon (it launches November), and as of today, you can get a taste of the PC version with the Sniper Challenge demo. To get access to it, you've got to pre-order (not pre-purchase) at a particpating retailer (for North Americans, it's GameStop). If you don't feel like pre-ordering or just want to see either way what to expect in terms of PC features and performance, read on.
As you can see in the video below, the demo is extremely brief. However, there's a fair bit of replay value to tide you over in the form of leaderboards and upgrades, the latter of which improve things like reload time and controlled breathing.
It's worth noting the PC version seems to have gotten help from Nixxes Software, who you may know for having worked their technical wizardry on the PC version of similar title Deus Ex: Human Revolution.
Processor: AMD Phenom II X6 1055T 2.8GHz (Stock)
Memory: Corsair XMS3 8GB DDR3-1600 (1333mhz)
Graphics: XFX Radeon HD 6950 2GB (Stock)
Driver: 12.7 beta, no CAP
These are not yet known. However, using the demo as an early guideline, it's safe to say anything medium or high end should do just fine.