It looks like True Blood viewers will be seeing a lot more of the American Vampire League on season four.

Jessica Tuck, who has appeared on the HBO hit since season one as spokeswoman Nan Flannigan, has been promoted to series regular. This piece of casting news follows the announcement that Courtney Ford will also play a key role next summer.

Deadline Hollywood has also revealed the addition of three new actress/characters to the show. They are:

• Janina Gavankar as Luna, a sexy public school teacher and shapeshifter.
• Alexandra Breckenridge as Daisy, a member of a wiccan group formed by Fiona Shaw's Marnie.
• Vedette Lim as Naomi, a cage fighter.

What do you think of these additions? For more information on season four, visit our True Blood spoilers section.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.