Go to the new routes/cities that just opened up. Check back at past areas to see what other places have opened up for you after. Catch the legends and train your pokemon a bit more (I'm pretty sure they're under leveled), hatch the egg you get, fiddle with the national dex, explore.
But yeah...get started on those new routes/cities. Then when you're ready, fight the E4 again (they're stronger), and Cynthia and the Gamefreak Trainer.
You see, people, when you say you want original content, you get **** like the kinect. Think before you speak. -Giratlna