In large bowl, beat cream cheese, sugar, flour and vanilla with electric mixer until light and fluffy. Gradually mix in zest and eggs, one at a time on low speed until just combined. Remove 1 cup batter, place in a small bowl; stir in juice concentrate; mix well. Spoon orange and plain batters alternately over crust. Swirl batters with knife several times for marbled effect. Bake in center of oven for 50-55 minutes or until set but still jiggly in center. Turn oven off and let sit 1 hour with oven door closed. Remove and cool cheesecake to room temperature. Chill 3-4 hours or overnight. Garnish with Glazed Pecans before serving.