No menu posted yet, but taken from a WESH/Orlando article, quoting Disney Food writer Pam Brandon on the Disney Parks blog, says this about it:
"Brandon said La Cantinas [QS] menu will include chicken and beef tacos on handmade corn tortillas, nachos, epanadas and other offerings.
La Hacienda[table service], which will be open for dinner only starting at 4 p.m., will feature entrees such as roasted shrimp in pepper garlic broth, flank steak with spring onions and grilled red snapper with roasted corn and cactus leaves, Brandon said. In addition to main courses, Brandon said La Hacienda would serve appetizers including queso fundido, rib eye and roasted pork tacos and a traditional black bean soup. Deserts include chocolate churros, sweet tamales and fruit empanadas, the post said"
[] brackets mine