Fourteen minute film will be revealed at Next Fest in Los Angeles on August 9
Rapper opens up about progress being made on his forthcoming third studio album
US star raps along to tracks including 'My Name Is' and 50 Cent's 'Candy Shop'
Rapper Future also appears on new song
Lamar's third album is set for release this autumn
LA rapper performs cover version at first ever iHeartMusic Awards last night (May 1)
Alicia Keys and Hans Zimmer also join the rapper on Fallon
Prosecutors claim the athlete argued with girlfriend Reeva Steenkamp over 'Bitch Don't Kill My Vibe'
US rapper's last album, 'Good Kid, M.A.A.D City', was released in 2012
Vanilla Ice also made a surprise appearance at the event
Rapper teams up with the rock band on their hit track 'Radioactive'
Rapper left awards ceremony empty handed on Sunday (January 26)
US rapper denounces his Best Rap Album win and announces huge Irish live date
Rapper picked up four awards at US ceremony, including Best Rap Album
The rapper also goes on to talk about the reaction to controversial track 'Control'
The pair preview their new song in a commercial for portable speakers
The rapper was honoured with the title this week
Plus; US star Future reportedly files $1.5m lawsuit against Drake after being sacked from US tour
Rappers walk through Compton for visuals on 'My Name Is My Name' track
Lamar claims he "tucked a sensitive rapper back in his pajama clothes" in new verse