If you go to his site, he just updated with all the details of how he gets those shots. You need to make a lot of changes for Skyrim to look like the promo material.
No you don't. You change a couple of settings in the ini that most people have already done. I just got done reading his "Madness in the Method" post and there are like 5 settings that effect the game that he uses.
The secret to making Skyrim look like those screenshots is that there is no secret. It's all a bunch of time delay, right place, right time, free camera tricks that make for good screenshots, but it's nothing special about his ini or tweaks. In fact he could tweak the game even more and make it look that much better.
The person who runs that site is obviously very talented, and his screenshots prove it, but like I said on page one...this is how the game looks.