The new series formally debuts on April 15th, while the MMO shooter tie-in kicks off on April 2nd. You can get a preview of the game by checking out Massively's MJ Guthrie and her two-hour Defiance beta livestream.
[Update: Whoa, even bigger day for Defiance than we thought! Defiance's YouTube channel is spewing videos today. We've embedded the new game launch trailer beyond the cut, and there's a new Ark Hunter Chronicles episode up too.]