Yes, they were set up as the next generation of pirates, they will be crucial to the plot. Kidd, Killer, Apoo and Hawkins will probably tussle with Law, Zoro and Luffy over a Yonkou position. Or not, Kidd seems to be aiming for Big Mom and Luffy seems to be aiming for Kaidou. Still, it's not like Luffy and Big Mom are on good terms anyway.
Urouge went to some lightning island. Him being from a Sky Island going to a lightning island has an obvious outcome but I'm not sure Enel is involved.
Drake seems to have sided with Kaidou, for now. Whether it's to get in close so he can backstab him or it's genuine who knows.
Who the hell knows what happened to Capone. He floated up into some kind of thing in the sky and we haven't seen or heard of him since. Again, Enel maybe?
Bonney is important, somehow. She knows something, is related to someone, they want her power or whatever - Akainu was worried when she got away from whoever.