Sorry I'm first seeing your question now. I thought I had a picture, but unfortunately I guess I forgot to take one of the new exhibit (or I deleted it by mistake, but I believe it's the former).
I guess I can try to describe it though:
The extension is either the same size or a bit larger than the original exhibit. It's located a bit in the back compared to the original exhibit (it is located where there formerly were some paddocks according to Google Maps - what was kept in them? Axis deer? At least they didn't have those anymore when I visited). The extension exhibit is much more lush and generally much more pleasant to look at than the former except that it's still too small. I seem to remember that the two exhibits are connected through some sort of gate.