I would bet that the Oklahoma plotters are involved in the NYC plot and the Feds will continue to keep a lid on the story until they're ready to release it. I would expect they're still following, wiretapping, arresting Hinrichs' Pakistani collaborators.
I have no doubt that AQ would exploit a stupid kid to do their dirty work if the opportunity presented itself - the only catch would be making sure the stupid kid didn't talk to the police if he decided to bug out.