I would imagine so if it's a defect. Although I wouldnt go within 100ft of an apple store after trying to buy an extra lightning cable. Probably 150 people in the small mall store all surrounding about 10 employees.
i believe not. i had a coworker try it and was turned away, obviously they can do GB replacements, but not a new for new swap. (i know all 5's are new right now) so im not sure how the policy is being enforced during launch week, but my guess is not.