Valve’s update earlier this week for Portal has sparked several hints to what the company is working on such as Steam coming to the Mac OS X. The Portal gaming fans out there have uncovered more information as well, hints of Portal 2 and it’s story line. All of which ended up confirmed thanks to GameStop putting out a Portal 2 pre-order with information attached. GameStop ended up revealing information about a new feature that Portal 2 will have, which is two-player co-op mode . Gamestop has the following information on their site which indicates the new game mode:

“Coming this holiday. Portal 2 is the sequel to 2007′s Game of the Year and draws from the award-winning formula of innovative game play, story, and music that earned the original over 70 industry accolades. Features single and multiplayer co-op modes. The single-player portion of Portal 2 introduces a cast of dynamic new characters, a host of fresh puzzle elements, and a much larger set of devious test chambers. Players will explore never-before-seen areas of the Aperture Science Labs and be reunited with GLaDOS, the occasionally murderous computer companion who guided them through the original game. The game’s two-player cooperative mode features its own entirely separate campaign with a unique story, test chambers, and two new player characters. This new mode forces players to reconsider everything they thought they knew about portals. Success will require them to not just act cooperatively, but to think cooperatively.”

Furthermore, popular gaming magazine, GameInformer, released their new cover for the month of April, indicating that they will have a full-featured Portal 2 article with information on “gameplay mechanics, storyline, and some surprising new twists.” The magazine cover release picture can be found below:

According to MacRumors, Portal 2 will also be available for Mac as discovered with a part of a leaked image from the GameInformer magazine, which can be found below:

Stay tuned for any news regarding Portal 2. What are your thoughts and comments on the whole announcement? Share your thoughts and comments below.