Gamitopia has posted a preview of Zoo Tycoon, where you'll be challenged to build the most healthy and vibrant zoo possible. Heres a snippit:

    The gameplay in Zoo Tycoon takes place in a park-like environment, where you play a zoo manager. The game will feature similar gameplay and technical characteristics to what we saw before in other Tycoon titles, such as the ability to build buildings to support the park (such as fast food joints, bathrooms, etc.), control the prices of items (such as admission, food, etc.), look over your visitors (seeing if they are hungry, how they feel, etc.), and so on...