I suspect Frankfurt may make some changes after the gorillas have moved into Pongoland....it depends how things go with Matz.
Being a record-holder I doubt if he will last more than a few years at the most. Surely when Matze dies a problem will arise if Rebecca has a newborn by him. Both him and Rebecca are over-represented (as Yassa observed correctly).
I will go to Frankfurt tomorrow, but I am not sure if I will make it to the zoo. I will try and get hold of the design plan. But if I recollect what I saw last time around (October-wise) each ape species has only 1 exhibit. The other species are colobus monkey and a Cercopithecus-species.
I probably will end up in the Senckenberg Museum and the Palmengarten. I will fly on Monday to Oman (for some serious sandstorms .... and gazelle/oryx watching).