Although you will still find some of the Ritual missions in the game, the meat of CS: Condition Zero is a new mode programmed by Turtle Rock Studios. Twelve Ritual missions will be in a section of the game called "Deleted Scenes." These missions were the best of the 20 or so that Ritual developed. But the new game mode that will comprise most of Condition Zero is a Tony Hawk Pro Skater-like challenge mode.
CS:CZ has already been leaked as well.Missed that, prolly because I didn't care to notice