The Turtle Rock Studios Website offers hints at the Left 4 Dead developer's plans to develop "Secret Project #1 for THQ," which they say "just happens to be the most exciting, ambitious thing we’ve ever attempted," echoing the sentiments they expressed when they signed with THQ earlier this year when the game was referred to as a first-person shooter. This is reinforced by this note from the website: "Experience with CryENGINE would be a major bonus, but not essential." Thanks VG247.