You have found a new Gate to Oblivion
My friend Nick pointed me in the direction of a video which shows TES:4 Oblivion as rendered using Crytek’s amazing CryEngine 2 (used in Crysis and in the upcoming Farcry 2.) If you have not yet seen this video I would highly encourage it, as it shows the amazing detail and map sizes possible with CryEngine 2.
If the sheer scale was not enough, the video also demonstrates dynamic light change in the form of a sun rise at the end. Simply breathtaking, these stills do not do it justice.