I cant wait to see who the new Rider will be in Book 4. I kinda hope that it'll be Arya. I think the Rider will be Arya because the color of the book is green, the dragon will be green and Arya's magical color is green. The Eragon and the Varden need another Dragon Rider on their side and Arya would do good in their cause. However if Arya joins the Varden, how will Galbatorix retaliate to the sudden strenght that the Varden gained.