Splinter Cell: Conviction has been in development for quite a while. It seems hard to focus on this, Ubisoft having entered a phase of churning out their franchises once a year, saturating the market and our consciousness with too many games, multiple teams working on alternate sequels for each series. But then that madness stopped, and now Conviction is over two years late. Which all seems to be pointing toward its being two years better, too. And the co-op - this could be another good reason to be excited about it. Rather than a tacked on mode for the main game, it's a two-player prequel to Conviction's main story, lasting around six hours. There's a trailer about it below.
So make of it what you will. You've got two characters, Archer and Kestrel, and a collection of cooperative challenges. Take a look: