Incredible photos! Really love the fact they listed which extra apps/accessories were used. I'm on the 5S now and plan to upgrade to the 6S when it's out. Hopefully the camera will be even better by then.
In the same boat with you, waiting for 6S because I have an iPhone 5S.
Proving the ol' adage once again, "good photography is not about the camera, it's about the photographer."
This article explains how Apple found the photos.
Kind of strange that they are only crediting the photographers with their first name and last initial. My friend Julian Bialowas had his photo used on a billboard right off the freeway in SF.