They're actually playing characters in the backstory of ACE. You may notice a couple of those people from the original groundbreaking have been replaced with different people (people that resigned or left the company.)
New version of photo, note the differences (Landau's hair mainly!)
That's not Jon Landau, it's a character he's playing named "Marshall Lamm." You can see to the left of the groundbreaking pictures, the following framed photos and documents. The whole story reads from left to right. The groundbreaking photo is near the end of the story, on the right...
This is a photo of Marshall... notice the CG hair... this is because it is not Landau, he's just playing a character in the story.
Here is a letter to the board members of ACE, explaining that a deal with the Na'vi has been struck. It even goes into detail about an old RDA facility and mess hall they can utilize for tours.
Here's Marshall and ACE employees placing the Mo'ara sign with the Na'vi when they struck the deal:
And here's a letter from Marshall to his wife for some reason, explaining how happy he is to have made the deal:
If you follow the story to the right it shows some of the unique sights of Moara, and this image of the Na'vi helping to open up that weird air cleaning plant a little more for us:
The opening team for Pongu Pongu:
And this Navi dude is showing us the sacred place of song. Nice dude.
Now, my favorite part, is if you go allll the way to the left side, even before the Marshall photos and even before the entrance from the line to get food, on the very left wall, is a sort of prequel to Satu'li.
Here we see the mess hall in its original state, when the RDA was using it:
Love that they took the time to do these. At first I didn't like the framed photos on the walls when they added them after previews. But I've come to appreciate what they're going for with them.
And one last final photo.... alll the way to the right, passed allll the photos on the main wall, near Mobile Order pickup, are the last sets of photos. These simply show the natural beauty of Pandora. I think they're implying that Marshall and ACE are good people, and are not here to destroy like the RDA, but to enjoy instead. Or maybe just pretty pictures of plants. Either way, a nice ending to a photo-essay on the walls of the quick service in a new theme park land.