I'm guessing that's the species they will probably be going for, I can't imagine the old elephant paddock would really be suited for either White rhinos or Black rhinos.They were on the waiting list for Indian rhinos but this was 10 years ago now.
If it were black rhinos the paddock would have to be split in half like they do at most zoos, and I think they would need a much bigger paddock if they were going to house White rhinos (similar to the one at Cotswold I guess).