For the diet coke drinkers, when you pick up a 600 mL Reward bottle with 'feeling a little Fresh' as the slogan, when you go to coke unleashed to redeem your code, and enter fresh as the label word you get a coupon for a free 600 mL bottle of diet coke at Priceline. If you live near a Priceline you could drink an infinite loop of free Diet Coke!
You need to hand in the 'Fresh' label with the coupon to redeem.