Prepare grill, or heat a grill pan over medium-high heat.
Brush chicken with juice; sprinkle with seasoning and sugar. Place chicken on grill rack or grill pan coated with cooking spray; grill 4 minutes on each side or until chicken is done. Cool slightly. Cut chicken into 1/4-inch strips; set aside. Place tortillas on grill rack or grill pan coated with cooking spray; grill 30 seconds on each side or until golden brown.
Combine coleslaw and salsa; toss to coat. Combine tomato and olives; toss gently.
Spread about 3 tablespoons beans over each tortilla; divide chicken evenly among tortillas. Top each serving with about 2/3 cup slaw mixture, 2/3 cup tomato mixture, 4 teaspoons cheese, 1 tablespoon sour cream, and 2 teaspoons cilantro. Sprinkle each serving with 2 teaspoons pumpkinseeds, if desired.