I'm not fan on Jon's new design, especially because he looks too old for my taste. But I'm actually happy to see him aged up : the character had become the insufferable cliche of a goofy superpowered kid in Supersons and he was en route to be become so uni-dimensional than any variation from the "Goody two shoes goofy kid" was raising hell ("Oh noew! How does a 10 years old dare to say that he doesn't want to go to school today!?").
I can't help but feel that Bendis is trying to harness the vibe of New 52's Morrison Superman with Jon. He seems set to be willing to rock the cart a little, to be more proactive compared to his father's passivity and upholding of the status quo. With probably Lois managing to forge the best of both world's way.