So this is what we know as of July 2012:
It is no longer on the regular menu. It is a "special". Make sure your server tells you the specials.
The rotation for lunch is different than dinner. So, every three weeks at dinnertime, there is a buttermilk chicken dinner for the week. The dinner is served with mashed potatoes and a vegie (and gravy unless you ask them to hold it!) One of the other specials is pot roast. Not sure the third.
For lunch, one of the lunch specials is buttermilk chicken (without the vegie). Not sure the other two.
When we check in, we have the resort concierge call over and find out the specials for lunch and dinner.Yep, they think we are crazy but

I have tried calling ahead of time but I never could find out so I just wait until I get there.
We love Olivias. The warm coconut bread, the friendly "home" atmosphere, the key lime pie! And a boat ride afterwards to Downtown Disney to walk off all those calories!
If you have any further questions, feel free to PM me.