Found a decent video here (gamma is messed up, though)
http://www.youtube.com/watch?v=BdwHQ1-jArg
Also, the beginning (better quality)
http://www.youtube.com/watch?v=2tYz02oG570
That first video showcases one of the most demanding areas in the entire game yet it seems to hold a near perfect 30 fps throughout. Very impressive, I must say. It certainly looks a fair bit beyond "medium" settings, but I don't think we can directly draw parallels between the PC options and this as they've likely customized individual settings across the board rather than going entirely "medium" or "high".
I'm really stunned that they were able to keep the entire game in tact. In fact, I didn't even believe this was possible until recently. In 2007, nobody could have guessed this would have happened.