Per DVCmember.com If your stay is after April 15, then no worry. Some have suggested that they should not take that long. But, if there will be a change you will not know until 30 days before checkin:
To accommodate this important process, animals are not scheduled to be on Sunset Savanna from January 15, 2009, through April 15, 2009. As a reminder, Members and Guests who reserve a savanna-view room during this time will be advised of this process, and confirmations for those bookings include a notation to that affect.
Approximately 30 days prior to arrival, the resort will determine, based on occupancy and booking date order, which Members will be assigned to a Sunset Savanna view room. Affected Members will be notified, and after their stay, will receive a Vacation Point credit reflecting the difference between a savanna view and standard view (no additional compensation will be given).
If this process is not acceptable to you, please consider alternate stay dates or resorts. Also remember that animals on the other savannas can be viewed from multiple public locations at the resort.