It did look like the trunk opened behind the glass like a SRT-10 trunk. I'll see if I can get them to pop it open tomorrow.
But, if you look at this picture, you can see the struts.... so maybe there is a hinge at the top of the glass....
New body panels appeared to be roof, deck lid/glass and rear fenders and fascia. You'll notice that side marker lights (square) had to be added as the rear fender covers the tail lights.... the marker lights appeared to be off another vehicle.
Yes, those are GTS tail lights... and also the rear brake light looks to be the same one as was on the GTS as well. So folks really do get some of their GTS again!