This looks like a great new series on the SyFy. It premieres on April 15th at 9/8c.
This second trailer is from Showcase Network in Canada. They are showing it also.
(This trailer is inapproriate for some ages- there is graphic blood)
This bottom trailer is not for the television series but rather for the Defiance game that goes hand in hand with the series. This looks like a blast to play.