I have a pc and a x360, i actually have a ps3 too (gathering dust...)
The console version will be much alike but the pc version, ahh, it's gonna look so much better
but comes out april 24th (ouch)
Don't know what to do, spend less money for better graphics but wait 1,5 month...
They didn't put any extra work in dark souls 1 and the difference is pretty big, so I think you can say the pc version of dark souls II will be a very big difference
Anyway here's a side by side comparison of dark souls 1 on the pc and the consoles (oh and do activate 1080p in the video, so you can see the difference)