I don't feel like anything on these plans could be a lion exhibit, but could be wrong. The area labeled "New African Exhibit" seems roughly the same size as the current jaguar exhibit in the photo, and the website advertises the new lion exhibit being open-air "barrier free" -- I don't feel like there's enough room to do that in that space for a pride of lion. It also says that the lion exhibit will be right near the entrance, so I'm not really sure where it's going to be.
It seems like there going to be removing the african spurred-thighed tortoise yard to make room for the top african (lion?) exhibit, as it doesn't seem to be indicated on the map. Perhaps they might actually be mixed in with the giraffes?
Speaking of the exhibit, what do you think could be going in the one in the bottom left?