Sad day indeed.
I was packing to drive to Reno for the Sunday finals when I got e-mails and a phone call.
Based on the few photos and videos that I've seen, the elevator trim tab was definitely missing and another part of it was loose. This photo, allegedly taken at the last moment, shows the tailwheel down, and oddly enough, no pilot is visible.
I have heard that a Mayday was called, followed by the pull-up, and then the barrel roll into the ground. It may be possible that the pull-up caused G-loc.
My thoughts are saddened by the terrible loss of 9 people so far, and hope no more fatalities occur as a result of this accident.
Shawn A.