Spoilers will follow.
So vampires are cool and Slayers are bad - I see someone decided to take advantage of Twilight fangirls! Twilight, the book series irl, not Twilight, the mysterious villain.
But more importantly: Siren gets pregnant with Jamie's kid, and when the kid (Sean) is born, Jamie goes to touch him... and absorbs him. So now Siren has promised to kill Jamie. I'm sorry, but this is sheer ridiculous awesome, as far as plotlines go.