After baking on this for an hour, I think Flynn is in sheer survival mode. That may be obvious, as he is seeking immunity. But I mean that it's entirely his instinct of self-preservation that's at work here, not some crazy big revelation that he wants to reveal. And I don't see him doing this out his love for the American people.
Don't get me wrong, the man was a distinguished soldier and commander. But he's a terrible bureaucrat, being forced out of his directorship of the Defense Intelligence Agency in 2014. His bungling, combined with the kind of personality he must have to win over someone like Trump to begin with, suggest to me that he's a coldhearted son of a bitch who's looking out for number one. And he sees an opportunity here. He might get immunity during this Russian investigation, which is reaching fever pitch. Maybe he's thinking that the intelligence committees will grant it to him out of sheer excitement.
Either way, Sean Spicer is gonna be sweatin' tomorrow. Ho-ly shit.