Some updates from my visit of July 19, 2016.
(I have not been to the zoo in about three years, so some of these may not be new per se).
Fennec fox on display in the exhibit that rotates periodically between fox and tortoise.
Native reptiles now on display in the former frogs and toads of the world house on the Arizona Trail.
African reptiles on display (and out of place) in an alcove in the Arizona Trail.
Second jaguar exhibit being built adjacent to existing one (so that both jaguars can be out at once).
The mixed species South American wetlands is now an American alligator exhibit (which is what it was years ago).
California condors on display in the large flight cage on Arizona Trail. A new smaller flight cage is near it to exhibit the bald eagles that were formerly in the large cage.
I've been there a tad more recently and some of your reports are new such as that they're rotating the Fennec Fox with the tortoise. My friend gets confused when she goes to visit and sees the tortoise there and wonders what happened to the Fennecs that where there "last time" so I'll be happy to report back to her with that.
The alligators went in last year. December 2015. There's 8 of them and they came from Florida. I saw 5 of them and the docent said he's seen 7 of them and the 8th was under the bridge thing "somewhere".
I don't know what happened with Ralph. Unless you ask someone about an animal specifically, they don't generally tell you unless it was a "big name" animal like Papago the Lion or Missy (I think that's what her name was) their melanistic jaguar.
Last I heard, one of the coatis had moved into the old Bald Eagle flight cage. I don't often get a chance to visit the Arizona Trail when I'm there so I have to rely on my friend to report what she saw.
I had no idea they were building a second yard so they can have both jaguars out and visible to the public. Hopefully they'll use the same kind of fencing that is there now. It's much better for picture-taking.

I can usually spot the off-exhibit cat in the back if I look hard enough, but depending on the lighting at the time, I may not always be able to see it moving around.
Thank you, AD, for the information!