What will be really revealing at least for me is how Lance Armstrong talks about the team-mates (and others) who "outed" him for doping over the past years. If his mea culpa is genuine, and not just a carefully choreographed publicity production designed to benefit him personally, then he will refer to his (ex)team-mates and (ex)friends with humility and acknowledge that they were right, he was wrong, that they deserve our respect (and his) and that he deserves our contempt (and theirs).
On the other hand if he remains defensive when asked about the people that "outed" him that will reveal (at least for me) that nothing has changed, that he is merely engaging in a new form of self-serving behaviour.