Dave Meltzer said on the latest edition of Wrestling Observer Radio that the reason that King Barrett has not appeared on WWE television as of late is because he is injured.
The injury and the severity of the injury are not known at this time.
Barrett is still traveling with the WWE talents to all of WWE events, but cannot work so he is not used.
UPDATE: Barrett is out with a nerve injury in his neck, according to Pro Wrestling Sheet. He is not expected to be out of action for too long.