Could it be a new way to include app and playlist recommendations or something else. Couldn't be the Red Hot Chile Peppers making their entire catalog available. That news is already out. Let us know what you're hearing out there. In the meantime, let the speculation commence.
Separately, check out this tidbit in a Swedish business daily (thankfully translated by The Wall Street Journal) where Spotify CEO Daniel Ek offers up some hopeful sales projections for the current year.