Rights to "Under the Dome" were purchased right away by Steven Spielberg and DreamWorks. Spielberg's involvement should guarantee the project comes to fruition (although we heard the same thing about Ron Howard and The Dark Tower).
Now, just a few words about the novel itself. For a book set n one location, it's huge. It's like "The Stand" in length if not scope. King is a master at the ensemble cast. Yes, we have a main protagonist, but it's the rest of the characters that make the book hum. Considering this makes "Under the Dome" perfect for a series.
That's the good news. The bad news is that the ending sucks. I try to avoid spoilers, but I'm going to spoil this one if you haven't read it. Malicious alien children are responsible for the dome. The way King explains it and how he has his characters finally get out from under the dome was a major let down compared to everything else that came before it.
According to Deadline Hollywood's article, the project is now out looking for writers. My plea to whomever they hire (I'm available) is CHANGE THE ENDING.
Since it will be a series, the hired guns should have plenty of time to come up with a better ending. Maybe even King himself can come up with something else.
The bottom line is that this is just one more reason for me to get cable.