It looks like Caroline and Tyler will be having a Romeo and Juliet love affair with the warring Forbes and Lockwood families. The Vampire Diaries started this at the end of season 2 when Mayor Carol Lockwood threatened to replace Caroline's mom as sheriff, and while that scene seemed innocent, it was obviously designed to set up a big storyline for those two founding families.  Jeremy also looks to be getting a big storyline as the ghosts of Anna and Vicki try to give him a message. Clearly him seeing dead people isn't just a side effect of coming back from the dead, but also an important part of a larger mystery.

Finally, Vicki's and Anna's ghosts will have a powerful message they're trying to deliver to Jeremy which will have a huge impact on he and Bonnie's relationship. Sounds like we're in for a treat this Autumn.

TVBuddy an American Vampire Diaries fansite has also said that when the CW listed the official cast for season 3, it included Joseph Morgan as Klaus, which suggests that he has most likely been promoted to a series regular, or at the very least, he'll be in a lot of season 3. This makes sense since we'll be getting an origin story for how the Original Family became vampires and why Klaus was so eager to team up with Stefan.