I saw this on allears in an article, not sure of the date:
This new location serves Chicken Nuggets, a Fried Chicken Breast Sandwich, and a Vegetarian Flatbread Wrap. Fries (not McDonald's) and Coke products are also available. A much needed seating area has also been added. (photo shows outside seating only - it's just a more substantial looking cart/building - there won't be seating inside).
I believe it is between Frontierland and Adventureland, if it is in the same place as the french fry cart. But I can't say I noticed it on either of our last trips, but I probably just wasn't paying attention. It's not too far from Pecos Bills if that's the place I'm thinking of.