Deadline Hollywood is reporting that Dane DeHaan and Rebecca Wisocky have both joined the cast of True Blood Season Four. DeHaan will play Timbo, one of the teens Jason Stackhouse (Ryan Kwanten) takes care of in Hotshot. He also plays Jesse on the current season of HBO's drama In Treatment, so he'll be pulling double duty for the premium channel. Wisocky (90210) will play Queen Mab, who is described as an elegant beauty who presides over a fantasy land and also has a temper. True Blood Season Four premieres summer 2011.