@dragon(ele)nerd: It is a massive project that has run from the summer of 2007 and won't be finished until at least spring 2011. It is almost halfway done!
@ColumbusZoo001: you really think that the zoo will only have 3 elephants on close to 4 acres of land? You might be right though, as there is a lack of births to accommodate all of the numerous elephant expansions that are ongoing in North American zoos. I think that there will be at least 17 zoos in North America that by 2013 will have 3.5 acre (or more!) elephant paddocks.
I'll need to post the photo tomorrow, but it looks like as of now Habitat 2 is split up. I started to see the other side of it on my last visit. It will be interesting to see the third exhibit as it's been hard to see any of that so far.