Again with the DX11...
I highly doubt DX11 will be used.
In one interview, it WAS said that DirectX 11 is supported, however, it doesn't sound like they'll make extensive use of its benefits, as it's said that their focus is on making all versions look the same.
Although depending on how much freedom the Creation Kit gives modders, I could see DirectX 11 support being helpful for graphics mods, but in the unmodded game, I think we can safely assume that we won't see anything done with it that consoles can't do.
So there you have it, the PC version will probably look a little better than the console versions, maybe, but not by any significant amount, by which I mean, we're not going to be seeing tessellation or anything like that (tessellation given as an example because it seems like that's the latest obssession in graphics, at least on these forums. No discussion of graphics can be had without it being mentioned if it's at all applicable.) Of course, once you bring mods into the equation, the PC version will surely be able to look much better than the console versions ever can, but that doesn't really count as not everyone who gets the PC version automatically benefits from that. Only those who choose to download mods do.