According to id Software creative director Tim Willits, RAGE 2 is a possibility.
“There is a lot riding on it, we need to make sure it’s great. Don’t f**k it up!” he said
“One of the things that we’ve done, is historically our games have had a start and an end and that’s it. So with RAGE we purposely wanted to make a much broader universe. So we want you as the player to feel that things happened before you got there and that things will happen after you leave, like a Star Wars universe.”