I did the NHTSA complaint and emailed GMC - no response from GMC, what a surprise. Got nowhere with 2 dealers, so I set up an appointment with Safelite - I have $0 deductible comprehensive coverage. I'm not going to screw around with GMC playing games with me. I'll keep my rear defroster relay out until the recall fix comes out. Pretty disappointed in GMC.
Count me in for the party: 2016 Sierra, smelled and saw the smoke while driving and then the driver's side window panel exploded almost immediately. I'm going to stop by the dealer tomorrow to see what they say.