Araragi doesn't need to know about their details. Araragi is lacking in experience but VERY strong compared to them. Kiss-shot Acerola-orion Heart-under-blade (:prayge:) literally explains how this will be an easy task for Araragi (Even though she knows how lowly regular humans are, which he was just until recently).
This movie is not gonna feed you information that doesn't matter to Araragi/Araragi didn't know about. And funny thing is, for those who REALLY wanna know more about them, maybe you shouldn't have skipped the entire explanation at the end of the first movie. Flashing text is not scary, just pause at the right time.
