Blacklight: Tango Down is already a sales hit for developer Zombie. Even though it came out on the XBLA just a week ago, the insta-hit has already spawned a sequel. Zombie CEO Mark Long confirmed the news on the site, Big Download, earlier today. What we have been told to expect so far are larger maps and controllable, mech-like vehicles.
Regarding the first game, Mark Long mentioned there are no plans for DLC.