In a large shallow dish, combine the limeade concentrate, oil, 1 teaspoon salt and 1/2 teaspoon pepper; add pork. Turn to coat; cover and refrigerate for at least 20 minutes.
For salsa, in a small bowl, combine the tomatoes, green pepper, onion, 1/4 cup cilantro, jalapeno, lime juice, garlic powder and remaining salt and pepper. Set aside.
Meanwhile, cook rice according to package directions. Stir in remaining cilantro; keep warm. Drain pork, discarding marinade. In a large nonstick skillet, saute pork for 5-6 minutes or until no longer pink; drain.
Sprinkle 1/3 cup cheese off-center on each tortilla. Layer each with about 1/2 cup pork and 1/4 cup salsa; top with 1/2 cup rice mixture, 1/4 cup black beans and 1/4 cup sour cream. Fold sides and ends over filling. Serve with remaining salsa.