Here is an article posted in the new TV guide by Manny Coto:
"Jack starts next season in a very different place than any other season so far. Let's put it this way, I wouldn't be surprised if there's no CTU next year. CTU has become almost too comfortable you know?....We're pulling the rug out from under our characters. It's a pretty radical shift-a totally different context with a totally different villain. There will not be a ticking clock on a nuclear device. We're hewing much close to real life: tighter, more personal, more difficult for Jack. There may even be a plot thread that doesn't take place on US soil. In a sense, it's a reboot in location and personnel. We're going to be introducing a new stable of characters, along with a couple of old ones. Jack's not living under an alias. He's found a place he thinks he belongs and a job he enjoys doing that doesn't involve the government. What's also refreshing is the choice of villain: It's not a terrorist at all. And the character is fascinating, someone with a supremely dark past who's done something horrific and whose ambition is to regain his stature in the world. I just can't say enough how exciting it is. It's going to be pretty damn cool".