Apple retail employees know nothing more than what you can get from public sources. They aren't briefed on any upcoming products until the day of (or at the very most the day/night before). The most they might know about is some sealed promo material showing up, but they aren't allowed to open that until the authorization pops up on their system from Apple corporate, which again is usually the day of or the day/night before.
So likely the guy was just repeating the same rumors that have been going around, and since their policy is to not confirm rumors, he had to correct himself.