...According to Joe Mallozzi:
Our second order of business was providing notes for episode #1. Brad and Rob did a terrific job of kicking things off in thrilling fashion. The script is fast-paced and fun; its characters unique and engaging. My favorite: Dr. David Rush. Oh, he’s going to be a handful. Originally planned as a two-parter, Brad and Robert quickly discovered that there was simply too much story for such a tight frame, so the series opener is now looking like a three-parter.LinkTomorrow, we discuss Brad’s first story following the big three-part opener, establish some of the big picture storylines and arcs we’d like to pursue over the course of the show’s first 20 episodes, and then start breaking Carl’s story.
I think it's a good idea. If they don't think they can fit the whole thing into 2 hours, then it's best not to rush it. Should hopefully give the series an epic start.