Here is the PC cover art for the upcoming Portal 2 from Valve Software.
The game is a sequel to the highly popular Portal which won several Game of the Year awards. It is one of my favorite games of all time and the multiplay demo at PAX last summer was a big hit.
The new game aside from the solo play story mode features a co op mode and supposedly the ability to play against people on consoles even if you are a PC player.
Look for Portal 2 in April 2011.