Mix 3/4 cup mayonnaise, 2 1/4 teaspoons curry powder, and next 3 ingredients in small bowl for sauce. Let stand at room temperature while preparing sliders.
Place turkey, next 6 ingredients, remaining 1/4 cup mayonnaise, and 4 teaspoons curry powder in large bowl. Mix with fork or hands just until blended (do not overmix). Divide mixture into 12 equal portions. Using wet hands, form each portion into patty about 1/2 inch thick.
Preheat broiler or heat 1 tablespoon oil in heavy large skillet over medium-high heat. If broiling patties, brush rimmed baking sheet with 1 tablespoon oil and arrange patties on sheet. Broil (or cover patties in skillet and cook in batches) until cooked through, pressing patties down lightly with spatula before turning over, about 3 minutes per side (or 4 minutes per side if cooking in skillet).
Place patties on bottom halves of rolls. Top each patty with sauce. Cover with roll tops.