Learning he has a cousin and whatever Eiko was to him was pretty big. Also that the Superman of her world would have accepted him. Not so much that Luthor was pretty much a dick in any universe.

He was whelmed, as Robin would put it. Definitely whelmed. So whelmed that Superboy doesn't even know what kind of questions he wants to ask. Or even if he wanted to ask them. Did he really want to know how her version of him was like? That was something he needed time to think about.

"Yeah, I'll see you around." He waved goodbye to her, not wanting to actually say the word. Then Superboy turned and dropped off the edge of the building.