Dean Ambrose was written off of WWE television last week to film his role in the upcoming WWE Studios production "Lockdown." Filming is currently scheduled to take place through September 20, 2014. Ambrose would be available for Night of Champions on September 21, 2014 and is advertised for the television tapings to follow.
The storyline is Ambrose went "missing" after "refusing treatment" for "head and spine trauma." We recapped that coverage at this link. Triple H discussed Ambrose in his latest kayfabe interviews that you can watch here and here.
The backstage reaction to Dean Ambrose's program with Seth Rollins was very positive. It was seen as one of the best undercard programs in quite some time and received rave reviews all around.