I like the face studies on the top pic showing a stern, coy, and happy Superman. There is a sort of retro-feel to these pics and Supes' body type. It sort of reminds me of Wayne Boring a bit. And is there anything better than the iconic 'ripping the shirt off' Superman pose.
I like the Supergirl design a lot. It is a mix of my favorite Matrix-style costume with the red skirt and full shirt. But we also get some DCnU flourishes of the high cape and funky boots. Add to that a 'Gwen Stacy' headband, and that design is a winner. I would still love to see if there were other designs that didn't pass muster for Supergirl. Did they try the DCnU one piece?
I also like how young they have Supergirl and Superboy look. Con looks like he's 12. Kara looks like she's about 15. Even Jimmy looks more like the copyboy he was initially. This is a kid's comic ... it should have kids in it.
We also got to see some of the villains that are upcoming. I like Lex in the evil green lab coat. Brainiac looks more like the Brainiac from Geoff Johns and Gary Frank's pre-New Krypton story than either Silver Age or DCnU. And I love the quirky craziness of Mxy too.
And lastly we round out the cast.
Poor Chris. He is stuck as the miffed Lor-Zod here.
And then there are Jimmy's cub reporter friends.
And no Superman Family book would be complete without Streaky! Aw yeah!