The success of "Under the Dome" is obviously the reason. The official word:
CBS has given a straight-to-series order for 13 episodes of EXTANT, a serialized drama from Steven Spielberg’s Amblin Television and CBS Television Studios. The series will be broadcast during summer 2014.
EXTANT is a futuristic thriller about a female astronaut trying to reconnect with her family when she returns after a year in outer space. Her experiences lead to events that ultimately will change the course of human history.
“EXTANT is a very original concept with layers of humanity, mystery and surprise that reveal itself throughout the script,” said Nina Tassler, President of CBS Entertainment. “Our partnership with Amblin for UNDER THE DOME showed that viewers respond to high-quality event programming in the summer. We look forward to building on that with EXTANT and offering CBS audiences another high-concept, unique event for summer television.”
EXTANT is a co-production of CBS Television Studios and Amblin Television. Steven Spielberg, Greg Walker, Mickey Fisher, who wrote the script, Brooklyn Weaver, Justin Falvey and Darryl Frank will serve as executive producers. The series will be distributed domestically by CBS Television Distribution and worldwide by CBS Studios International.