Valve, as we've seen recently, can be something of a closed shop. Notoriously hard to get hold of or engage with from a press angle, the PC poster child is annoyingly good at sticking to its policy of controlled information.
Individual executives, however, are often happy to speak quite freely when given the chance, and this on-stage keynote with Gabe Newell and Star Trek director JJ Abrams is an excellent look at what powers the fizzing quantum computer we all suspect is behind Newell's unblinking gaze.
Their discussion, billed as "Storytelling Across Platforms: Who Benefits Most, The Audience or the Player?" is a close analysis of narrative traditions in gaming and film, what can be done to improve each and what they can learn from each other.