According to a source cited on NASCAR.com, Kyle Busch is headed to Gibbs where he will unseat J.J. Yeley in the historic #18 Interstate Batteries car.
UPDATE: It's (seemingly) official. Kyle Busch informed Ray Evernham and Richard Childress today that he is indeed going to Joe Gibbs Racing. Two other interesting likely changes are noted in this Jayski post:
1. Joe Gibbs Racing is apparently probably trading in their Chevys for Toyotas. That's huge.
2. The current driver of the #18, J.J. Yeley, is going to the #21 Little Debbie or (whatever it is now) car owned by the Woods Bros.