Some time ago the remix of Kardinal Offshalls 'Set if off' feat The Clipse leaked, this time as a remix featuring Dre too. He rips it with a deep dominant voice.
The other more recent rrack leaked was Eminem feat Dr Dre and 50Cent - 'crack a bottle'. Now this track which isnt even a single a lots of succes, it reached number 4 in the UK charts, jumped from from 78 to no 1 in the Billboard charts and with iTunes broke the digital record for number of download sales for any track, in it's first week > 418,000.
Source - http://www.detnews.com/apps/pbcs.dll/article?AID=/20090211/ENT04/902110409