Well here is an interesting wrinkle regarding the grand opening. ZooNooz (May issue) has articles on all the exhibits and the intro note from board chairman says it opens June 9. Their website dedicated to Africa Rocks has a big countdown leading to the same thing. Everything they are putting out makes it sound like the entire area opens then.
However on their Facebook page May 3 they did a post promoting it and someone asked when it opens. Here is the important part of the reply: "...we will be opening areas of the habitat as animals are moved in ...The Cape Fynbos habitat, where the penguins will be located, is set to open in June. Stay tuned for more info!"
So are they saying only one of the six exhibit areas will be open on the grand opening date?