from the www.imdb website
'Seven' Sequel, But No Pitt
2 January 2003 (WENN)
A sequel to hit film Seven is to be made - with original star Morgan Freeman but minus hunk Brad Pitt. The grisly serial killer movie wowed audiences in the 1995 who watched as Pitt's character Detective David Mills was left bereft after his wife and unborn baby became the lastvictims of Kevin Spacey's eerie psycho. Instead the action will center on Freeman's character William Somerset, who partnered Pitt in the first film, as he comes up against another serial killer - who has psychic abilities. An insider says, "The gruesome climax had previously ruled out a sequel. But bosses think they have the right script now. Brad's character will be mentioned, but he will not appear. He will be in a mental hospital."
I do not think the film is in production yet possibly 2006?