http://boards.polycount.net/showthread.php?t=65408
That is mostly default crysis assets, there are some new objects I don't recognise (mostly stone ruins) but overall that is out of the box stuff. The quality of the props that the crysis artists made were unbelievable, plus add in some cool engine lighting system and voila you have amazing looking stuff.
Now actually moving around that as a working level that does not need deep blue computing power and AI fighting across all those props is something else. :P