Combine 3/4 cup orange juice, water, 1/2 teaspoon salt, coriander, cinnamon, and 1/8 teaspoon pepper in a saucepan; bring to a boil. Remove from heat; add couscous and cranberries. Cover and let stand 5 minutes; fluff with a fork. Transfer couscous mixture to a large bowl.
Heat a small skillet over medium heat. Add nuts to pan; cook 3 minutes or until toasted, stirring frequently. Add nuts, chicken, and next 3 ingredients (through cilantro) to couscous; toss.
Combine remaining 1/4 cup orange juice, 1/2 teaspoon salt, 1/8 teaspoon pepper, lime juice, and mustard, stirring with a whisk. Gradually add oil to juice mixture, stirring constantly with a whisk. Drizzle juice mixture over couscous mixture, tossing to coat.