All I could find online was this, from WDWNews:
"NEW MENU FOR TUSKER HOUSE -- Tusker House Restaurant in Disney's Animal Kingdom is reopened as a buffet restaurant that includes a character breakfast, Donald's Safari Breakfast. Hours are 8-10:30 a.m. and 11:30 a.m. until the park closes. The restaurant features both indoor and outdoor seating."
(http://wdwnews.com/viewimage.aspx?imageid=109090&siteid=1)
I also saw "Dinner: 3:30 p.m. to varies with park hours"