A fantasy-animals-themed land was also featured in the DAK introduction that Disney published in an Annual Stockholders report from the 90s (I forgot which year it was, but the cover had dalmatians on it). The land wasn't named. The fact that it was mentioned doesn't mean that it was actually going to be built, but I've heard that it was and it wasn't.
I agree with Corrus that a Narnia-based land probably won't happen. Lewis' estate has traditionally been extremely protective of his works, similarly to Tolkien's (yet both of those estates allowed cheap animated films to be made; the wonder of it!). Furthermore, Walden--not Disney--owns the rights to the books. Disney is merely releasing and advertising the films (the "attraction" at the Studios doesn't count as anything other than an advertisement).
Tangent: Imagine the threads if the internet existed when Walt Disney bought the rights to the "Oz" books. The studio announced they were making Oz into an animated feature--Walt and Annette even talked about it on the Mickey Mouse Club--and then it never happened. Considering the animated feature that could have been made from the book series, "Return to Oz" barely counts as utilizing the rights ownership. Moral of the story: Don't take blue-sky things too seriously, because solid information probably exists to confirm and deny the same thing.
