Latest from Kristen @ E! Online:

According to sources, Kristen Bell will not be a regular this season on Heroes, but she will appear in a recurring fashion - most likely 5 episodes.

The only new regular will be Cristine Rose, who plays the mother of Nathan/Peter Petrelli.

Jack Coleman (Noah Bennet) and Zachary Quinto (Sylar) will be sharing loads of screen time together, and its said that Sylar is going to start working with H.R.G!

Also those interested can catch Brea Grant aka the new villain Speedster who will be appearing on the next Watch with Kristen Show.

Source: Kristen @ E! Online