I am more worried about the controller than the internal hardware, I think.
I'd love to see some precise controller. But I don't know what kind of black magic would be needed for that.
If they could come up with analog sticks that are more precise, that'd be great.
Of course mouse and keyboard support is ideal. But the truth is that I play on my TV, which is in my bedroom, so I play on my bed, always have since my first console.
So mouse and keyboard is a little uncomfortable. And I'll still be playing fps multiplayer games on the PC.
But an imprecise controller is a pain, even on single player games.
I'll probably buy the PS4 1 year after release, or the second revision, or when Metal Gear comes out

I still love the exclusives.