Orang enclosure is a very basic ape design. Old brick building with a small grassed paddock with wooden climbing frame surrounded by concrete stepped moat filled with water. Very poor when compared to the gorillas.
Dolphins are unlikely. The current sealion pool was originally designed with dolphins in mind, which explains why it is a decent size (for sealions) - that would be my guess at why the idea was being mooted. There was talk of having underwater viewing for the sealions when the first takeover was happening, however whole enclosure will need scrapping in the near future due to concrete cancer.
If you think keeping polar bears and elephants in captivity gives the animal 'rights' groups ammunition...
Blackpool has never had much money thrown at in the days of being council-run. One only has to look at the state of many fences (state of near collapse). The design of enclosures throughout the zoo also reflects this lack of modernization since the '70s. The current management regime also hinders development and moving forward. Compare Blackpool to Marwell which are both the same age! I realise that the buyout was intended to overcome some of these problems and although I haven't been back up there since the takeover I see little improvement/change (plastic dinosaur amusement parks aside). It will be interesting to see if the second new owners pump the capital in. My thoughts are that they will always struggle. The 'clientel' coming to Blackpool was the worst I have ever seen at a zoo that I have worked in. And also Chester is just down the road...
I was at the zoo last year and I actually think it looks the best I have ever seen it since I started visiting in about 1993! The new walk-through enclosure with squirrel monkeys etc. is an absolutely brilliant exhibit and it's probably one of my most enjoyable zoo experiences ever. Some of the other primtaes have been given good new hotwired enclosures, such as howlers and spider monkeys. The new big cat development and the entrance building are also very impressive. There have also been some very promising new additions to the collection in recent times - red river hogs, bongos, vicuna, red fronted lemurs and red pandas spring to mind.
I think and hope that Blackpool Zoo continues to prosper - whilst it does look quite dated in places, I think that things are definitly looking up, and hopefully the arrival of giraffes later this year will bring the crowds in. Rome wasn't built in a day but they're certainly making progress!