According to video games industry valued media partner (aka journalist) Geoff Keighley in a new iOS app that details the making of Portal 2, that very game will be Valve's last "isolated single-player experience."That corpse of strangled English for "single-player game" was spotted by MCV, which has Mr K quoting Valve's Gabe Newell.
"In the application Keighley said "Portal 2 will probably be Valve’s last game with an isolated single-player experience," saying he heard this directly from Valve boss Gabe Newell."
Says the full story...
which is here.