Ok, I've been trawling through the planning applications to see if I could find any more details on the expansion and I came across an interesting document.
(https://pad.doncaster.gov.uk/NPSPublicDocs/00834239.pdf)
It shows all animal houses built for the first stage of the expansion and enclosures without naming the species which will reside in each enclosure. It also shows some areas and houses which will be used for future stages.
First of all the Spot house and Brava house are I assume for the Spotted Hyena and Gelada respectively. However, that would mean the Gelada enclosure is larger which I'm unsure on.
The other enclosure bordering on the existing area is labelled as for Asian Hoof stock and is a relatively large house which appears to be able to split into four distinct areas. There are at least two species of Asian Hoof stock in this area.
There is one massive house which is not being used for this phase which could be used for Elephants as previously suggested.
It would appear there will be an African and Asian aspect to this next stage. In my opinion the African area is at the top of the map and the Asian area at the bottom.
As for the final enclosures in my proposed Africa section is one for a future date and another smaller one called the Havanna house which is split into two enclosures.
In the lower section there are two smaller exhibits which have no animal houses attached to them.
That leaves the Pump house which appears to have no outdoor exhibits attached to it.
Then the large Sierra house which has large and has two outdoor enclosures one which is quite large and both have pools in them taking up a large proportion of the exhibit.
There is then the Tango house which has a large outdoor attached to it with water and a lot of vegetation.
There is then another medium sized enclosure with no house but vegetation and water in it and another smaller enclosure attached to it.
There are couple of other exhibits planned for later stages in this area.
On a different plan which shows the visitor hub, as well as plans for a hotel, there appears to be a pool for visitors, a new shop and an amphitheater for animal shows.
I would be extremely interested in hearing your predictions for what will inhabit the different exhibits. Perhaps with some sort of competition to see who gets the most correct/closest.
In the meantime I will continue to search for other documents that give more details on the situation.