The files are all named with a variation of “radio button” and are accompanied by an icon that looks like a radio image that was previously used in iTunes for the Mac. As 9to5Mac points out, the iPad’s music app does not currently support radio functionality, so the images and files may point to an upcoming feature.
Jailbroken iPhones do not include the images, which means that this could be a streaming radio function that is limited to the iPad, and because some of the files are labeled with “buy” in the file name, it might be a hint that Apple is indeed working on releasing a Radio service. Of course, that the files are only on the iPad may also mean the service is being tested on the device before it comes to the iPhone.
Recent rumors have suggested that Apple is going to take on streaming music services like Spotify, Rdio, and Pandora with its own streaming music radio offerings. Apple is allegedly in talks with several different major music labels, with plans to launch a service in 2013.
Radio icons labeled with “buy” do indeed strongly imply that such a service is coming in the future, but it is important to note that Apple’s iPod nanos support radio functionality with the ability to purchase played songs from iTunes, which, once again, means there’s no concrete evidence as to whether Apple will release a streaming music service.