I can hardly wait! On the extras disc from Season 4, it has a teaser for season 5. Apparently, Jack (under an assumed alias) is some sort of undercover cop or something working in Chicago (I believe), but he's forced out of hiding when someone hacks Chloe's computer at CTU and learns that Jack Bauer is still alive.
I can't even imagine what's gonna happen this season, what kinds of twists are gonna be implemented. I'll give my thoughts on the season premier after watching it later on tonight.