Maureen Ryan, a Chicago Tribune Reviewer has just recently released a minute of the first episode of Season 5. Sit back and enjoy:
Interesting to note the director Mark Mylod, he seems to be the director commissioned for Season 5. Mark was the man in charge for most of Season 4, and his debut was in the episode ‘Strange Days’ in Season 3.
Also for further spoilers check out Wikipedia’s Season 5 Episode Guide, where they reveal some basic plot outlines.