Even though the Pepsi/iTunes commercial hasn’t yet aired today, Apple has already updated its teaser page for the promotion with official rules, a FAQ, a redemption link and other contest details. In addition, Apple has added a “Redeem Song” button to the main page of the iTunes Music Store (iTMS) that allows you to enter your bottle cap code quickly and easily. All iTunes song prizes must be redeemed by April 30, 2004. The maximum number of valid codes per person that can be entered on the iTMS is 10 per day and 200 total throughout the promotion period. According to numerous MacMinute readers, the first Pepsi/iTunes bottles are already in circulation.