The main signage for the 'new' version of Out of Africa must have been out of date almost before the exhibit was completed - rather than the implied Patas and colobus this is home to L'hoest's Guenons and Syrian Rock Hyrax.
Patas monkeys have been moved down the bottom of the zoo ppposite the cheetahs and honestly don’t know where the colobus monkeys and gone or even if they are still in the collection.
@taun The mangabeys are still there, further off to the right (past a little picnic area) - the lion enclosure extension and 'new' Out of Africa are on the footprint of the 'old' Out of Africa, which was two narrow primate enclosures either side of a covered corridor (last time I was there they held ruffed lemurs and colobus).
Where you can see the 'welcome' sign at the left is where the entrance to the old complex was and the little corridor up the side of the lions that used to have spiny mice at the top - there's now a small interactive display there (and the stuffed lion that was previously there).