I don't think anything is happening at the CC site. They are pretty resolute about the whole road extension thing, and the chain is too focused on other properties to worry about the CC site anytime soon. Unless they get a good offer to sell to place, or start offloading it into parcels, I expect to have to wait a few more years to see anything happen to the place - and even then I expect it to be sold off somehow.
The whole Zoo/Animal theme park thing was definitely proposed and kicked around soon after CC closed down. There are some concept photos floating out there somewhere that leaked after the chain had already shot the idea down.
I've seen a lot of good ideas for the place, but actually turning them into reality is ridiculously tough, and no one is willing to take the risk at this point.