Detox isn’t lost album
In 2014,When 50 released his hit-single 'Smoke(+Trey Songz)prod.by 'Dr.Dre+Dawaun Parker+Mark Batson' from 'Animal Ambition' album. Trey Songz said, that originally he recorded this song for Dr.Dre's Detox.
In 2013, 50 Cent released his smash single My Life(+Eminem+Adam Levine)prod. by S1 from 'Street King Immortal' album. Roc Nation producer S1 said, that 'My Life' beat he created for Dr.Dre's Detox album.
In 2012, 50 Cent released single 'New Day'(+Dr.Dre+Alicia Keys)prod. by Dr.Dre+Swizz Beatz+Eminem. Swizz Beatz said, that 'New Day' was created for Detox.
Also Dr.Dre gave his beat to Aftermath member Kendrick Lamar. You can hear it in song The Recipe(+Dr.Dre)prod. by Scoop DeVille.
It's seems Detox is alredy come out and You can listen it in 50 Cent's albums:'Animal Ambition' and 'Street King Immortal' and in Kendrick Lamar's album: 'good Kid, m.A.A.d city'. But It seems 50 will not use Dr.Dre's Detox beats his new version of 'Street King Immortal'.