Edit: Dining reservations for lunch from December 4th onward may be available by phone. Try calling 407-WDW-DINE (407-939-3463) if you’d like to book a reservation.
Tusker House, the breakfast/lunch/dinner buffet in the Africa section of Disney’s Animal Kingdom, will become a character meal beginning December 4, 2011. Characters and food are expected to be the same, though it should come with a price increase. I wouldn’t be surprised to see a $10/adult price increase to put it more in line with the likes of Crystal Palace. As far as I know, pricing is not available, but I’ll update if I see anything official. It also appears that Tusker House is currently unavailable for reservations during lunch hours after December 4th while the system is updated with the new information.
Official information here: http://disneyworld.disney.go.com/dining/tusker-house/.