Looks like Apple has tightened app store submissions staring May 1. I have an app that uses Spotify and have been accepted into the App Store multiple times. On a recent u
Disclaimer: I work for Spotify
We're aware of the issue and working on making a hot-fix for iOS which removes the need for UDID access. Hang tight!
Edit: Hot-fix is out! Grab it at http://developer.spotify.com/technologies/libspotify . A corresponding release of cocoalibspotify is coming soon, but in the meantime it can be easily changed to support a different version number of libspotify.