I'm SO excited about these films. It'd be cool to have the original cast in major roles, but at their age, I can see them standing back and "passing the torch." I personally would love to see the next generation from the Expanded Universe books translated to the screen. I grew up reading the teen novels about Han and Leia's twins Jacen and Jaina and their friends.
I'm just so excited that JJ Abrams is doing Star Wars. It's gonna be amazing.
Apparently in addition to this new trilogy, they're also developing three films independently. One will cover Han Solo's backstory, which I'm really excited about. I love the story behind how he and Chewbacca met. I'm kinda rooting for Zac Efron to play young Han Solo; he's actually a really great actor and he's been growing into his looks and could totally pull off a young Han.