Portal 2

Portal 2 was released on April 19, 2011. There were numerous planned release dates, however all were delayed, except for this one. Portal 2 is the sequel to Portal.

In-Yogiverse
There are currently two Portal 2 playthroughs on the yogscast channel. Simon's singleplayer playthrough and the Co-Op playthrough starring Lewis and Simon. The two modes have different campaigns and a different plot.