The lead designer of Left 4 Dead has announced that he's making something like Left 4 Dead again - a four-player co-op shooter that "expands on the co-op-formula in ways I've wanted to explore for a long time".
Whatever they end up calling it, the game is in development at Bad Robot Games, a studio founded by the film and TV outfit behind Lost, Cloverfield and Westworld. So the project has both expertise and funding to spare, in theory. There is little else to tell, right now, but you can sign up for a playtest if all this has you combing the rooftops for Smokers and scrabbling around for your shotgun.