September 2008 Sees the Release of the Purple Box from Valve, similar to the Orange Box from last year. Here's the contents:
-Half-Life 2 : Episode Three
-Left 4 Dead
All for the low price of 49,99$
*this is only speculation*
Wouldn't it be awesome? Left 4 Dead is already scheduled for release around September, HL2:EP3 is probably well underway since the release of EP2 (development started on it before the release of EP2) and Portal 2 doesn't seem like it would be complicated to build another 2 or 3 hour game. It would be a pretty similar package, Left 4 Dead replacing Team Fortress 2 as the multiplayer game. Valve would rise to a status of deity if they did that...