UPDATE: Valve also confirmed the news with the world's shortest press release. Coming holiday season 2010!

March 5, 2010 - Valve, creators of best-selling game franchises (such as Left 4 Dead, Counter-Strike, and Half-Life) and leading technologies (such as Steam, Source), today announced Portal 2 for shipment this coming holiday season.
 
Portal was originally released in 2007 and earned over 70 industry achievement awards.

 After days of hinting, Portal 2 has officially been revealed by the April covers of Game Informer. Next month's issue, which should hit subscribers soon, will feature two different wraparound covers that reveal the sequel for the first time, along with the teaser "Aperture Science returns for the people who are Still Alive." It needs to be said: I'm making a note here, huge success.

Here are the two April covers next to each other:



As a huge, huge fan of Portal, I've been following all of Valve's recent shenanigans, from their radio update to adding a new ending to the 2007 game, which was one of the most clever things I've ever seen in the industry. We don't have any details on the game itself just yet, but knowing of its existence (and seeing those amazing covers) are good enough for now. Expect some light to be shed when the twelve-page cover story hits later this month.