There's a 24-prequel in the works
Jack Bauer could return for another series of 24 in a new spin-off which is in development, according to reports from insiders.
Variety quotes sources as saying that a prequel focusing on the adventures of a young Jack Bauer is being developed by showrunner Howard Gordon and the co-creators of the original series, Bob Cochran and Joel Surnow.
That would imply that Kiefer Sutherland wouldn't be involved, and also that Jack Bauer has apparently dedicated his entire life to preventing presidents from exploding. Perhaps we'll see his first "DAMN IT" thrown at a flustered school librarian when the last copy of Moby Dick has been checked out the night before his book report is due.
Other details are sketchy-to-nonexistent at the moment, and it's a bit of a punt that it'll make it to air at all since the last time 24 tried to reboot itself without Jack Bauer in 24: Legacy, it all ended pretty limply after a single season and viewing figures which dived quicker than a put-upon counter-terrorist agent jumping off the side of an exploding building.
It might also follow the pattern of both 24: Legacy and 24: Live Another Day, Sutherland's last outing, in being 12 episodes long rather than the more traditional 24.