The 750Ti 2GB card was outperforming XBONE on a decent system w/ Titanfall, so I'd imagine that will be at least enough to run it at pretty good system settings.

I'd imagine the newer set of nVidia cards (GTX 550+) would likely be requirements.

P.S. I dont' know about RAM, but I can imagine it may need some extra beef. I've only got a 32-bit system. I hope it's good enough.

This is pretty much what I think too. xD

Well, one thing we need to keep in mind is they have already said the recent Xbox demo was running
@ 30fps 1600 x 900 high graphics settings.

With our PC specs and anyone with similar or above, I see no reason to not be able to achieve that quality and much more. Otherwise, we are talking a seriously bad optimized game. I have no reason to believe this will happen. I trust CDPR. They are PC devs first and foremost.

I think with the nVidia hairworks tech. and running ultra, then yeah. it's gonna be pretty taxing. This is why I suggest grabbing a cheaper 6 series card for dedicated physX since we know the game will utilize it. It is a cheaper alternative at least to going SLI or buying a single expensive card. Surely if you are in a position to go SLI or buy a powerful single Maxwell or say 780/ti, then go for it.

This is probably my most anticipated game right now. Witcher 3 and the next Fallout game :)

Much more interested in OS requirements, as these are the roots, from which hardware choices grow.
Heard rumors, that no XP expected, Win7 only. If anyone heard something, please advice.

Well, since XP isn't supported officially anymore by Microsoft, I guess that's probably true. I've just preoredered this week, let's hope my gtx 460m will cope with it using at least decent settings.

I'm hoping they allow for some neat customization regarding view distance and the whole "no loading"-feature as I rather want 60FPS but I'll have to wait a couple of seconds every time I leave or enter a certain area than no waiting but 30FPS or mini-stutters whenever I play as that usually pushes me closer to insanity.

Anyway, with a Core i7 and a GTX770 I think you'll be quite fine. Don't expect to run with Ubersampling-types of features but they usually suck anyway with horrible performance/IQ ratio.

As for OS support I would be very surprised if it's officially supported by XP, it's possible you might be able to do some heavy tweaking to get it running but that will likely cost you a lot of time and energy that would have been put to better use like finding work extra to earn the extra cash necessary to purchase a modern computer.