'True Blood's' Jessica Tuck reveals that Nan and Bill have history

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HBO just released the most revealing trailer so far for "True Blood's" Season 4. 

In it, we see the American Vampire League's spokeswoman, Nan Flanagan, assigning Eric (Alexander Skarsgard) and Bill (Stephen Moyer) to damage control on the human-vampire relations front after Russel Edgington's (Denis O'Hare) very public display of vampire blood-thirst in Season 3.

New series regular, Jessica Tuck (who plays Nan) says that her character takes on an increasingly significant role in Season 4.

"It would be foolish to think that her efforts were just about making humans and vamps one big happy family," Tuck tells True Blood's Nest of Nan's work to mainstream vampires. "There is an agenda behind her agenda but that is not for me to reveal right now. Stay tuned."

And while we see her ordering Bill around quite a bit, the actress says there's something more underneath their adversarial relationship.

"All I can say is that Nan and Bill have a history," she says. "Details of that history will be revealed in Season 4. If I say anything more than that, I'll get myself in trouble."

"Relationships between the characters get much more complicated and redefined," Tuck also says. "I love this season - I think there is a lot to sink your teeth into. You won't be disappointed."

"True Blood" Season 4 premieres Sunday, June 26 at 9 p.m. ET on HBO.

What do you think Nan's agenda is?