Source is from someone who does marketing work for Beats Music.
He are the following artists who will drop new exclusive music on Apple Music: - Mac Miller (album) - Kanye West (new single from SWISH) - Adele (album) - Pharell Williams (new song called Freedom, and music video will be available through his Connect page) - Dr Dre will drop a new song from the NWA movie soundtrack - Tame Impala (single) - Drake (trailer for VFT6 will be available from his Connect page)
and more. I'll update the thread as I get more info. Stay tuned for today! Today is a huge day for music.
Not Kanye abandoning TIDAL 
