Well, first you'll have to know what Super Smash Brothers Crusade was: Super Smash Brothers Crusade was a large project built from the ground up and started by three die-hard Smash Bros. fans: Phantom7, Falcon8r, and Dr.MarioX. Their goal was to create a Smash Bros. game packed with characters and stages from the most memorable video games of all time and create a Smash Bros. experience that combines the greatest features that all three official Smash Bros. games have to offer.
Project: Crusade is a large, community-based, continuation of Super Smash Brothers Crusade, which Phantom7, Falcon8r, and Dr.MarioX resigned on and left in the hands of Dettadeus on October 2nd, 2011. A number of changes will be made to the roster (but not a massive number), and there's a Balancing Team that will figure out ways to make each character more balanced from a competitive standpoint. There will also be a Spriting Team to re-distribute the massive load of spriting that will be done, and a Graphics Team for forum and in-game menu graphics. All of these teams can be applied to on the first forum linked above. Basically, Project: Crusade is going to finish what Team Phalcon started.