(this is opinion and speculation)
My read from Harbaugh watching his interviews is that he LOVES Tyus Bowser and the whole defense, he thinks they're gonna be dominant as fuck - he likes the whole rookie class and thinks they will contribute a lot. He thinks Flacco will play, and if he does we're going far. Perriman he's less sure about because he gets injured so much. He just seemed less confident about him, but he seemed pretty sure about Flacco, like 'anything could happen but I expect him to play and us to win.'
Overall, I like his body language.