Riley was lookin good in the Elite 11 drills before he injured his hand. Trent Dilfer had high remarks for him. Even though he's listed as a pro style QB, he looked pretty mobile.
He is committed to Tennessee and will probably arrive on campus in July. I haven't seen anything about him being an early enrollee.
Either way, he doesn't look to figure into Tennessee's plans for QB next year. Peterman or Worley will start. If at any point next year Ferguson is the starter, than chances are we're in big trouble. Also Butch Jones is recruiting at least one other QB in this class as well.