Aside from a few short interviews and an investor conference, Cook’s session with Walt Mossberg was his first extended public talk as the newish leader of perhaps the most important and definitely most influential company in tech. Getting to see Cook in action is probably the most important part of this interview. While clearly playing it close to the vest, he ranged over a wide number of topics, from secrecy at Apple (it’s now apparently been doubled!) to the iPhone to controversies in China to a possibly more social partnership with Facebook to more television efforts to, of course, the legacy of Apple’s co-founder Steve Jobs, who died last year.