you that you can already do this, all you have to do is save your zoo and send it on e-mail to a friend
here is a quote from the developer diaries:
How does the Habitat Editor affect gameplay?
Stone: The way exhibit creation has been implemented in Zoo Tycoon 2 will allow people a greater level of creativity. There will be more personality in each exhibit. You'll be able to download someone else's zoo file from e-mail or the Internet, walk around their zoo and get new ideas for creating exhibits in different ways. We want people to look at someone else's zoo and say "Hey! I never thought of doing that!" We could very well see more fan competitions run for creative exhibit construction. In the end, this will add much more creative depth to the game.
justice is truth