The Hollywood Reporter has an article with all the details from PaleyFest.
You can read it all here.

Below are video interviews with the cast.

Film Review Online has an interview with Kevin Williamson and Julie Plec. They talk about the future of the show.

Read the entire article here. (Spoilers)

Here is an excerpt:

If The Vampire Diaries has a really long run, your vampire actors might start to look older, and vampires don’t age

Kevin Williamson: For everyone who’s been watching, they know that we’ve hinted at it already. And if you’ve read the books you know which character is the first. I’ll tell you it will be triggered by one peculiar activity.

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CanMag has an interview with Kevin Williamson.

Read the entire interview here.

Here is an excerpt: (SPOILERS)

The upcoming plots will focus on the triangle between the three main characters, but there will still be room for supporting cast, and even recurring episodic characters. “Those are our core group we’re going to stick to, and our supporting characters we’re going to stick to for the first season. Then we’re going to be bringing in new characters, like Melinda Clarke is going to come in as Matt’s mother. I’m hoping that she will always be Matt’s mother, so while she’ll come in for three episodes, I hope she’ll come back.”

IESB has an interview with Kevin Williamson.
He talks The Vampire Diaries and Scream 4.

Read the entire interview here.

Here is an excerpt: (SPOILERS)

Q: Which of the supporting characters have really interesting things coming up?

Kevin: Not this season, but anyone who’s been watching knows that we hinted of it already. If you’ve read the books, you know which character actually has the curse. It’s latent. It’s a repressed curse. It’s triggered by one particular activity that hasn’t happened yet, so we’ll go there probably in the next season. I think what’s going to happen is that we’re going to watch Tyler. It’s no secret that it’s Tyler. We revealed the full moon and we revealed all of his aggression issues, and we’re probably going to continue to let him explore his anger issues and his daddy issues and see what happens.

DVR Playground has an interview with Kevin Williamson and Julie Plec.

They asked them about the show and what’s coming next.
Read the entire interview here.

Here is an excerpt: (Caution Spoilers)

What can you tease about tomorrow night’s return of THE VAMPIRE DIARIES?
Julie Plec: Well, we pick up right where we left off when Elena’s life is both literally and figuratively still very much hanging in the balance. The big surprise is that just as we’re about to reveal who this man in the road she hit was, Elena gets rescued by Damon and they set off on an adventure together. Now, not having her necklace on, Damon could very easily have forced her to go, but she says yes on her own and they take a road trip to Georgia in pursuit of more answers on how to open Katherine’s tomb. It’s a fun episode because we haven’t yet seen Elena and Damon have a storyline together all and they’re together the entire episode, which is kind of awesome.