Season four of True Blood won't air until the summer of 2011. But we already know it will focus on witches.

We also know its premiere episode will be titled "She's Not There."

As for new characters that will be introduced? Entertainment Weekly has provided us with the following casting notices, as the series is looking for actors/actresses to fill the following roles:

Marnie: A pretend palm reader who gets possessed by the spirit of a real witch.

Portia: Andy’s sister, a very pretty lawyer. Likely to get naked a lot.

Naomi: An Asian-American, lesbian cage fighter.

Queen Mab: A temper-filled beauty who presides over a fairy/fantasy world.

Suzanne McKittrick: A spoiled, Real Housewives-type who is rumored to be a Shapeshifter.

Got any casting suggestions? Remember: our True Blood forum is alive and ready for discussion now and throughout the off-season!

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