The premise sounds a lot like that of the short-lived series 'Earth 2.' Does anyone even remember that series? On the other hand, the British series 'Survivors' (created by Daleks creator Terry Nation) was a lot like 'The Stand' by Stephen King. There are so few original premises left in science fiction anymore.
The show is headed to BBC America in December. Then we Americans can all judge whether or not the premise is an original take on the idea or a total rip-off. My guess is the former.