Please add to the OP that the PC version also comes with a $15 promotional gift card:
Dishonored
Edit: The Digital Foundry has already done a Face Off of this game. I've never seen them be able to complete one on release day, that's crazy.
http://www.eurogamer.net/articles/digitalfoundry-dishonored-face-off
Dishonored: The Digital Foundry Verdict
"The PC version of Dishonored is a creditable version with many advantages over the two console builds and is the preferred buy, while the differences between the PS3 and Xbox 360 games are wafer-thin."
In all, it's good news for everybody involved. As far as distinguishing points go, we're left with only a couple of oddities between the three formats to call out on. This includes the 360's gaudy splashes of colouring on certain surfaces, which otherwise remain clear on PS3 and PC, and the way shadows manifest in at differing angles on PS3. However, image quality and assets are largely similar, if not precisely identical, between the two console releases, with the PC going the extra mile with higher-grade textures and character models.
The widened field-of-view of the PC version bears mention too, plus the added accuracy of its mouse controls, which help greatly with lining up long-range projectiles or placing your next blink. Moving straight to the console versions afterwards also brings to light the higher levels of auto-aim worked into their targeting systems, plus the lengthier loading times in-between missions. The PC release may lack the extravagant PhysX bells and whistles added to Borderlands 2, but a respectable level of care has still been taken with this edition.
Overall, we've little to complain about when it comes to Arkane Studios' delivery of Dishonored on each platform. The core tenets of its branching stealth gameplay remain intact across the board, and the visuals are tightly pared. If you're steadfast in your console allegiance, the only considerable negative would be the higher rate of tearing on PS3 - though much of this is mirrored by the 360 version during combat. But if dropped v-sync is something you can overlook, the decision may well come down to controller preference, or even your uses for the PS3's 5.1LPCM support. Either way, Dishonored easily arrives as a worthwhile proposition on any platform."
Summary: The game performs fine on all platforms.