The trademark for Blacksite: Area 51 has been renewed in the United States Patent and Trademark Office by Warner Bros. Games.
Midway originally filed for the Blacksite: Area 51 trademark back in 2006, which was followed by the release of the FPS of the same name a year later for the Xbox 360, Playstation 3 and PC. Warner Bros. Games has since acquired the Area 51 license back in 2009, after purchasing the majority of the company assets from former developer Midway Games.
At this time there are no other details on if there is another Area 51 title being released, what developers would be working on the game, or what platforms the title will be released on.
Thanks to IGN.com for breaking this news.