Nobody knows, but when you get there, check the times guide they have for you to pick up at the entrance to MK. You should probably anticipate that if it is open, it will be only for lunch hours.
In all my trips I cant remember ever really seeing it open.. I would love to try it tho! If its open DH and I will grab something we can share and take it over to Pecos and get something we can share there as well, we both LOVE Pecos and dont want to give it up snf both want to try Tortuga.. Our other MK day we have LTT for lunch and CHH for dinner (lobster roll!!!)
When it is open, it is usually only 11-2, so a very small window. We love it, but most of the menu items are still available at Pecos Bills, as they share the kitchen. We LOVE LOVE LOVE the taco salad!