Really, we're not surprised to hear this may be coming, as a tipster just pinged us with info that an "AdKit" reference has shown up in a special file on Apple's public "Phobos" server. This file, which is called StoreBag, provides a public XML interface into iTunes. That interface describes how applications and web browsers can "call home" to either retrieve iTunes information pages or to request that iTunes jump to a given product listing.
What you see here is a key-value pair from that file. The URL string that follows after the "adkit-product-url" key suggests that Apple is about to introduce a way to link ads with product URLs. How will this URL work exactly? It's hard to say without any further details, which are regrettably sparse on the ground, but it suggests that ad sourced product links can be used in a similar way to affiliate-driven links.
Not much else is known about Apple's first venture into the ad business at this stage, but Steve Jobs has allegedly told some executives that this will be "revolutionary" and "our next big thing." Frankly, we're starting to get a little concerned with just how often the folks in Cupertino are bandying around the word "revolutionary" -- but we'll hold our judgments until after this announcement happens (if it happens at all).<key>adkit-product-url</key>