My 670 based system should be fine, though short on the VRAM...
Probably not a big enough gap to get on PC instead of PS4
But I'm still not 100% sold on this game. I didn't love Dragon Age Origins and gave up on II after about an hour (I think I got really distracted by either another game or potentially real life... that last one seems unlikely)
It looks awesome and the ideas they have put into it sound great, but I rarely enjoy fantasy/medieval RPGs. I'll probably buy it anyway, though I might wait for the price to drop a bit. I'll probably be busy with Unity when it does come out