"Yes. Although nothing’s official, rest assured there will be a second season of Under the Dome," Ausiello told a reader who wrote in to ask. "The only question is whether CBS will hold it until next summer or bring it back in-season (i.e. next spring)."
The series, based on the huge novel by Stephen King, follows the events in a small town after a massive, transparent dome is suddenly dropped around them and they're unable to access the outside world. It was adapted for television by Saga and Y: The Last Man author Brian K. Vaughan.