It is subtle and requires just the right reflection, but that looks like a major ripple or distortion in the top. I believe that the GT has V-bracing, so that almost looks like lack of support from a detached longitudinal brace. If you tap that area, can you hear any buzzing? I you reach inside, can you wiggle that brace?
Back she goes.... 
I fear that you are right, so I have decided to return it.
I haven't checked for a loose brace, since I don't want to mess with it too much. Even a minor ding or scratch could be a problem, when I return it.
I have described the issues to Thomann as the reason for returning it, so hopefully it won't get sold to someone else in this condition without them knowing. I have asked for a full refund, since they no longer carry the sans-electronics GT 811, so I'm afraid that they will instead insist on trying to repair it rather than ordering a replacement.
I also contacted Taylor support yesterday morning before posting here, but I still haven't heard from them.
It's a phenomenal looking guitar with a really pretty fretboard and I got it for $2400 (cyber week offer), so this is double frustrating, since I will now have to pay the full $2900 for a replacement.
Thanks to you both for helping me decide the best course of action.