I visited the Dallas World Aquarium very recently and noticed a few notable things.
3 new species have been placed on exhibit:
Golden-sided Euphonia in the manakin enclosure
Bronze-winged Parrot in the relatively new enclosure underneath the newly constructed bridge
Saffron Toucanet where the Curl-crested Aracari used to be, still with Elegant-crested Tinamou
In terms of changes to exhibits, Curl-crested Aracari have moved to the Veriscolor Barbet enclosure. I could not find the barbets so they may have been moved off exhibit. Black-necked Aracari can be seen in the Anteater enclosure, but the Many-banded Aracari are still visible in a fenced off region adjacent to this enclosure. The Occelated Turkey/Spectacled Owl/Agouti enclosure is under renovation. Above the waterfall in Mundo Maya a newly fenced off area can be seen holding several Occelated Turkeys.
In terms of construction, it is blocked off from public view by a very large wall, so I am unsure of what it looks like.
A few other notes, a Scaled Pigeon chick was view-able from the window in the manakin enclosure. Also in the manakin enclosure, the juvenile White-crowned Manakin has grown into its adult male plumage which is stunning to look at.