Spotify has just released SDK 23 beta and it would be great to support that. It looks like a lot of things have changed though.
SDK is now grouped into Authentication, Metadata and AudioPlayback functionality modules independent from each other. This functionality grouping is reflected in the "Spotify.h" header. SDK will be split into three libraries representing these functionality modules in an upcoming release.
Decoupling manifested in that all methods concerning Metadata that previously took a SPTSession object now instead take an NSString *accessToken argument which is a property of the SPTSession object.
Spotify has just released SDK 23 beta and it would be great to support that. It looks like a lot of things have changed though.