I just noticed something. There's a second tendon piece on the right side of the face that they forgot to attach to the left. And we know it's supposed to appear on both sides because it's on the original model and all iterations of the prototype prior to Shanghai WonderFest.
It's one thing to forget it for a convention, but the fact that they would overlook something like that when shooting the official marketing photos doesn't exactly inspire confidence...
EDIT: Well, they've fixed and overwritten the photos. You can still see what it originally looked like in the video they posted.