It's most likely similar to the final game, but with its differences. You either kill Breen (Consul) at the moment where he reveals his true identity, or follow the pattern of chasing him until he eventually dies by blowing up the citadel or making him fall into the citadel's abyss. (For me, 2002 and 2003 are the same stage of development, with the same concept until the game was leaked in 2003, where I would make the final change. For me, the chronology of the betas is 1998/2001, 2002/2003, 2003/2004.)
Yes, I'm answering a little late, XD