The production itself has been taking place since January this year. Alan Ball dished out on the second season, "There are new romances for Tara, Jason and Sara. Bill and Sookie have a lot of issues to sort out - including having made a new teenage vampire that's living in their house. Bill and Sookie also go to Dallas to find one of their own who has gone missing."
On another dose of "True Blood" news, Valerie Cruz ("Dexter") has been cast as an elegant Hispanic vampire named Isabel.
Also pointed out on true blood wiki