Seth Killian appeared on GameSpot's "On the Spot" and gives us a nice character walkthrough of Hakan. Also on the show is a short interview with Yoshinori Ono, talking a bit about Hakan and how they fit the Street Fighter 3 characters in the Street Fighter 4 universe.
The segment starts at about 30 minutes in.
Here are a couple YouTube clips that cut right to the chase for the Hakan character walkthrough. Thanks to QBoRo for the heads up.