Valve working with Microsoft on a release.
Out after Portal 2.
Three-map campaign coming in October.
The Passing owners get to "Bleed Out".
Includes weekly game mode "mutations".
Still down for release this "spring".
Left 4 Dead 2 add-on sounds substantial.
Plus: details on what happens.
Left 4 Dead image with fruity flavour.
Plus L4D1 add-on the following month.
Fresh campaign boasts original survivors.